JPS5926588Y2 - High voltage feedthrough capacitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-voltage feedthrough capacitor used as a noise filter for high-frequency, high-voltage devices, such as magnetron tubes used in microwave ovens.

Recently, high-power electromagnetic waves in the UHF and VHF bands have come to be used not only in industrial equipment such as broadcasting equipment, but also in consumer equipment such as microwave ovens, and as their use increases,
Noise pollution caused by electromagnetic waves leaking from these devices has come to be highlighted as a major social problem.

Various noise filters have been known to prevent such noise pollution.

Figure 1 shows a conventional example of a high voltage through-type ceramic capacitor used as this type of noise filter.
A dielectric ceramic 1 with electrodes 2 and 3 formed on both end faces with openings a is fixed on the floating part 5 of the grounding fitting 4 with the electrode 3 facing it, and the electrode fitting 6 is fixed in advance. A through terminal 8 with a tab terminal 7 formed at one end is passed through the floating part 5 of the grounding fitting 4 and each through hole 5a, la of the dielectric ceramic 1, and then the electrode fitting 6 is inserted into the dielectric ceramic 1. The dielectric ceramic 1, the electrode fitting 6, and a part of the through terminal 8 were further coated with a synthetic resin 9.

As shown in an enlarged view in FIG. 2, the through terminal 8 is formed by pressing one end of a cylindrical pipe to form a tab terminal 7, and then inserting an insulating tube 1 from one end on the opposite side of the tab terminal 7.
0, and then a ring-shaped electrode fitting 6 is fixed with solder or dielectric adhesive.

However, with the above structure, it is difficult to accurately determine the mounting position of the electrode fitting 6 with respect to the tab terminal 7 and the formation position of the tab terminal 7 with respect to the entire length of the through terminal 8. It was easy to invite and lacked credibility.

If such drawbacks are to be eliminated, it is necessary to determine the mounting position of the electrode fitting 6 and the forming width of the tab terminal 7 with high precision, which increases the cost.

In addition, since the main body of the through terminal 8 and the electrode fitting 6 are separate, the number of parts and man-hours are increased, resulting in a lack of mass productivity and increased costs.

Furthermore, since the outer circumferential side and the inner circumferential side of the dielectric ceramic 1 are separated by the electrode fitting 6, the flow of the insulating synthetic resin 9 during filling becomes poor, and voids are generated inside the insulating synthetic resin 9. There were also drawbacks such as a decrease in dielectric strength and poor workability.

The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a reliable, inexpensive, high-voltage feed-through ceramic capacitor that can be processed and assembled with high precision and ease.

In order to achieve the above object, the high voltage through-type porcelain container according to the present invention consists of a dielectric ceramic having electrodes on both end faces with through holes opened, and one of the electrodes facing the grounding fitting. A high-voltage feed-through type capacitor is provided, in which a through-hole terminal passing through a through hole of the dielectric ceramic is electrically connected to the other electrode of the dielectric ceramic, and an insulating resin is filled around the dielectric ceramic. In the above, the through terminal is integrally formed using a plate metal material having a thickness thinner than the diameter of the through hole of the dielectric ceramic, and is one end of a through part that penetrates inside the through hole of the dielectric ceramic. on both sides of the
It is characterized in that an electrode connecting portion is integrally provided and fixed to the other electrode so as to straddle the through hole of the dielectric ceramic.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The content of the present invention will be specifically explained in detail below with reference to the accompanying drawings, which are examples.

FIG. 3 is a cross-sectional view of a high voltage through-type ceramic capacitor according to the present invention.

In the figures, the same reference numerals as in FIGS. 1 and 2 indicate the same components.

As shown in the figure, in the present invention, the through terminal 11 is
It is integrally formed using a plate-shaped metal material having a thickness thinner than the diameter of the through hole 1a of the dielectric porcelain 1, and the dielectric porcelain 1,
A rod-shaped penetrating portion 11a passing through each hole 5a, la of the floating portion 5 of the grounding fitting 4. An electrode connecting portion 11b is provided on one end side of the rod-shaped penetrating portion 11a.
, 11C are integrally connected, and the electrode connecting portions 11 b, 1
1C has a structure in which the tip end surface of the dielectric ceramic 1 is fixed to the electrode 2 by soldering or other means so as to straddle the through hole 1a of the dielectric ceramic 1.

FIG. 4 shows a perspective view of the through terminal 11 obtained by press punching from a metal plate material.

However, the through terminals 11 can also be mass-produced by other methods such as a molding method.

Note that tab terminal portions 11 d are provided in series above the electrode connection portions 11 b and 11 c, and a heat-shrinkable insulating tube 12 is placed over the penetration portion 11 a.

As described above, in the present invention, the through terminal 11 has electrode connecting parts 11 b and 11 C connected to each other in contact with and fixed to the electrode 2 of the dielectric ceramic 1 at one end of the through part 11 a. Because of this structure, the electrode fitting and the through terminal, which were conventionally two parts, are now integrated into one part, and cost reduction is achieved by reducing the number of parts and man-hours.

In addition, there is no need for positioning or fixing work between the feed-through terminal and the electrode fitting, and it can be easily mass-produced using press processing, etc. Moreover, the dimensional accuracy of each part is extremely high, resulting in a low-cost and highly reliable product. be able to.

Furthermore, since the through-hole terminal 11 is integrally formed using a plate-shaped metal material having a thickness thinner than the diameter of the through-hole 1a of the dielectric porcelain 1, it is not possible to penetrate the inside of the through-hole 1a of the dielectric porcelain 1. When the electrode connecting parts 11b and 11C are fixed to the electrode 2,
The end face side of the dielectric ceramic 1 where the electrode 2 is located is wide open,
The grounding fitting 4 passes through the through hole 1a from the opening on the end surface side.
A communication path leading to the inside of the floating section 5 is formed.

Therefore, as shown in FIG.
Insulating synthetic resin 9 with case 13 attached to the outer periphery of
When filling, the insulating synthetic resin 9 passes through the communication path and is filled as shown by arrow A, making the flow of the synthetic resin 9 very smooth, improving filling workability, and preventing the formation of pores. is suppressed and the dielectric strength voltage is improved.

In addition, in the embodiment, a device including one dielectric ceramic 1 is shown as an example, but it goes without saying that it can also be applied to a device including a plurality of dielectric ceramics.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional high voltage feed-through ceramic capacitor.
Fig. 2 is a perspective view of the feedthrough terminal, Fig. 3 is a sectional view of the high voltage feedthrough ceramic capacitor according to the present invention, Fig. 4 is a perspective view of the feedthrough terminal, and Fig. 5 is a high voltage feedthrough ceramic capacitor according to the present invention. It is a figure which shows the resin molding process of a voltage feed-through type capacitor. 1... Dielectric ceramic, 2, 3... Electrode,
4...Grounding metal fitting, 9...Synthetic resin, 1
1... Penetration terminal, 11 a... Penetration part, 11 b, 11 C... Electrode connection part.

Claims (1)

[Scope of utility model registration request] A dielectric ceramic having electrodes on both end faces with through holes opened is fixed onto a grounding fitting with one of the electrodes facing the other, and the dielectric ceramic is attached to the other of the electrodes of the dielectric ceramic. A high-voltage feed-through capacitor in which a through-hole that passes through a through-hole is electrically connected and an insulating resin is filled around the dielectric ceramic, wherein the through-terminal is thinner than the diameter of the through-hole of the dielectric ceramic. The electrodes are provided at both ends of one end of a through part that is integrally formed using a thick plate metal material and that penetrates through the through hole of the dielectric ceramic, so as to straddle the through hole of the dielectric ceramic. A high-voltage feed-through capacitor characterized in that an electrode connection portion fixed to the other side of the capacitor is continuously connected to the same body.