JPH07192971A - High-voltage capacitor and magnetron apparatus - Google Patents

Abstract

PURPOSE:To obtain a small high-voltage capacitor whose mechanical strength and electrostatic capacitance are large and to provide a magnetron apparatus which reduces a leakage noise, especially at 1GHz or lower, form a magnetron. CONSTITUTION:A grounding metal fitting 10 is provided with a grounding electrode part 14 which is extended to the same direction as the extraction direction of feedthrough terminals 12, 13 and which is faced with the feedthrough terminals 12, 13 via a dielectric. In the respective feedthrough terminals 12, 13, parts which faces the grounding electrode part 14 are used as terminal electrode parts which are flat boardlike. Plate faces of the terminal electrode part are directed to the same direction. The respective terminal electrode parts are arranged so as to be faced with each other via the dielectric.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetron device used for household and industrial microwave ovens.

[0002]

2. Description of the Related Art A conventional magnetron device is shown in FIGS.
The small high-voltage capacitor 0 shown in FIG.
Issue). The high-voltage capacitor 1 includes a grounding metal 2, an insulating resin layer 3 integrated on the grounding metal 2, and an insulating resin layer 3.
Two through terminals 4 and 5 are provided which penetrate the inside and further penetrate the grounding metal fitting 2 in a non-contact state and have both ends led out to the outside. The ground metal fitting 2 includes a ground electrode portion 6 that extends in the same direction as the lead-out terminals 4 and 5 and faces the through-terminals 4 and 5 via the insulating resin layer 3. The penetrating terminals 4 and 5 have flat plate-shaped terminal electrode portions 7 and 8 in a portion facing the ground electrode portion 6 of the grounding metal 2, and the plate surfaces of the terminal electrode portions 7 and 8 face in the same direction and are juxtaposed. Has been done.

[0003]

However, the small high-voltage capacitor 1 used in such a conventional magnetron device has an electrostatic capacitance between the ground electrode portion 6 and the flat portions of the terminal electrode portions 7 and 8. Small capacity, especially UHF, VHF
However, there is a problem that leakage noise in the television frequency band (1 GHz or less) cannot be suppressed.

The present invention has the same size as a conventional high-voltage capacitor and has a large mechanical strength and electrostatic capacity.
It is intended to provide a highly reliable high-voltage capacitor and a magnetron device which reduce leakage noise from the magnetron.

[0005]

A high voltage capacitor of the present invention comprises a grounding metal, a dielectric provided on the grounding metal, and
A plurality of penetrating terminals penetrating through the dielectric body and having both ends led out to the outside in a non-contact state with the grounding fitting, wherein the grounding fitting extends in the same direction as the lead-out direction of the penetration terminal There is a ground electrode portion facing the through terminal via a dielectric, and each of the through terminals has a flat terminal electrode portion at a portion facing the ground electrode portion. The plate surfaces face in the same direction, and the respective terminal electrode portions are arranged so as to face each other with the dielectric interposed therebetween.

Further, the magnetron device of the present invention comprises the high voltage capacitor having the above construction.

[0007]

With this structure, a small high-voltage capacitor having large mechanical strength and electrostatic capacity can be obtained, and leakage noise from the magnetron can be reduced.

[0008]

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

The high-voltage capacitor 9 of the embodiment of the present invention shown in FIGS. 1 to 6 has the same outer dimensions as the conventional small high-voltage capacitor 1, and is a grounding fitting 10 made of iron, brass, copper or the like.
And a dielectric 11 made of a high dielectric material such as mica or barium titanate provided on the grounding metal 10, and penetrating the inside of the dielectric 11 and further extending both ends to the grounding metal 10 in a non-contact state And two penetration terminals 12 and 13 made of iron, brass, copper or the like. The grounding fitting 10 includes a grounding electrode portion 14 that extends in the same direction as the lead-out terminals 12 and 13 are drawn out and faces the through-terminals 12 and 13 via the dielectric 11. As shown in FIG. 3, the penetrating terminals 12 and 13 are provided with terminal electrode portions 15 and 16 each having a flat plate shape in a portion facing the ground electrode portion 14 of the ground metal fitting 10.
The plate surfaces 5 and 16 face the same direction, and the respective terminal electrode portions 15 and 16 are arranged to face each other with the dielectric 11 interposed therebetween. The protective cases 17a and 17b are made of the dielectric 11
It is made of the same material as. As shown in FIGS. 1 and 2, the high-voltage capacitor 9 configured as described above includes the terminal electrode lead portions 18 and 19 and the choke coils 20 and 21.
, And the grounding metal fitting 10 is fixed to the filter box 22 of the magnetron body.

Next, the operation of the magnetron device will be described. In the high voltage capacitor 9 of the embodiment of the present invention, since the ground electrode portion 14 and the respective terminal electrode portions 15 and 16 and the terminal electrode portion 15 and the terminal electrode portion 16 face each other in the same area, the facing area thereof is It is larger than the conventional one, and the electrostatic capacity and the allowable current capacity can be increased, and the mechanical strength is improved. Further, in the magnetron device provided with the high voltage capacitor 9, since the high voltage capacitor 9 has a large electrostatic capacitance, leakage noise from the magnetron can be reduced. Moreover, since the allowable current capacity and the mechanical strength of the high voltage capacitor 9 can be increased, the reliability can be improved.

Next, an experimental example confirming the effect of the present invention will be described. The magnetron device (invention product) of the embodiment of the present invention has a high-voltage capacitor 9 having the configuration shown in FIGS. 3 to 5, and the external dimension C of the high-voltage capacitor is 54 m.
m, dimension D is 42 mm, dimension E is 20 mm, capacitance is 40 pF, rated voltage is 100 V, output is 600 W, external dimension F of terminal electrode portion 16 is 20 mm, dimension FA is 1
5 mm, dimension G is 20 mm, and the material is dielectric 1
1 to mica, grounding fitting 10 and through terminals 12 and 13
Iron was used for each.

For comparison with this, the external dimensions F of the terminal electrode portions 7, 8 shown in FIGS.
Was also set to 10 mm, and a magnetron device having a conventional high voltage capacitor 1 with the same specifications as above was also manufactured.

When the level of leakage noise characteristics from the magnetron was investigated, the results shown in FIG. 7 were obtained. In FIG. 7, characteristic A shows the product of the present invention, and characteristic B shows the conventional product.

As can be seen from FIG. 7, the product of the present invention has a remarkable effect of reducing the leakage noise particularly below 1 GHz. For example, in the 30 to 300 MHz band, about 5 to 1 is obtained.
0 dB, which is about 2 compared with the conventional product of about 30 to 50 dB.
The level of leakage noise is reduced more than twice. The reason for this is considered to be that the capacitance of the high voltage capacitor 9 of the present invention is about twice or more that of the conventional one.

FIG. 6 shows another embodiment of the present invention, in which the through terminals 12, 13 on the side of the receptacles 23, 24 are bent at about 90 degrees from the vicinity of the terminal electrode parts 15, 16.
By bending it to about 90 degrees, the receptacles 23, 24
Since a sufficient space distance can be secured between the through terminals 12,
It is possible to prevent a burnout accident due to adhesion of dust, dust, and the like to 13 and the receptacles 23 and 24.

[0016]

As described above, according to the present invention, a small high voltage capacitor having a large mechanical strength and a large electrostatic capacity can be obtained, and a leak noise from the magnetron, particularly 1 GHz or less, can be reduced and a highly reliable magnetron device can be provided. What can be provided.

[Brief description of drawings]

FIG. 1 is a front sectional view of a magnetron device according to an embodiment of the present invention.

[Figure 2] The same low-side view

FIG. 3 is an exploded perspective view of a high voltage capacitor according to an embodiment of the present invention.

FIG. 4 is a front sectional view of the same.

FIG. 5 is a side sectional view of the same.

FIG. 6 is a front sectional view of a high voltage capacitor according to another embodiment of the present invention.

FIG. 7 is a characteristic diagram of leakage noise of the product of the present invention and the conventional product.

FIG. 8 is an exploded perspective view of a conventional high voltage capacitor

FIG. 9 is a front sectional view of the same.

FIG. 10 is a side sectional view of the same.

[Explanation of symbols]

 10 Grounding Metal 11 Dielectric 12, 13 Penetrating Terminal 14 Grounding Electrode 15, 16 Terminal Electrode

Claims (2)

[Claims] 1. A grounding metal fitting, a dielectric provided on the grounding metal fitting, and a plurality of through terminals penetrating the dielectric material and having both ends led to the outside in a non-contact state with the grounding metal fitting. And the grounding metal has a ground electrode portion that extends in the same direction as the lead-out direction of the through terminal and faces the through terminal via the dielectric, and each of the through terminals,
The portion facing the ground electrode portion is a flat terminal electrode portion, and the plate surface of the terminal electrode portion faces in the same direction,
A high-voltage capacitor, characterized in that the respective terminal electrode portions are arranged so as to face each other via the dielectric. 2. A magnetron device comprising a filter including a high-voltage capacitor, wherein the high-voltage capacitor has a ground metal fitting, a dielectric provided on the ground metal fitting, and penetrates through the dielectric material to be further connected to the ground metal fitting. On the other hand, a plurality of through terminals whose both ends are led to the outside in a non-contact state are provided, and the ground metal fitting extends in the same direction as the leading direction of the through terminals and faces the through terminals via the dielectric. Each of the through terminals has a ground electrode portion, a portion facing the ground electrode portion is a flat terminal electrode portion, the plate surface of the terminal electrode portion faces in the same direction, and A magnetron device in which terminal electrode portions are arranged to face each other with the dielectric interposed therebetween.