JPH11345744A - High withstanding voltage through capacitor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the reliability of product by reducing the occupation ratio of a filled and solidified resin mold to the entire capacitor thereby ensuring mechanical strength of the capacitor, and to enhance production efficiency by applying covers to the opposite sides of an earth plate while covering substantially the entirety thereof and injecting insulating resin into the inner air gap thereof and curing the resin thereby reducing the quantity of resin to be used and shortening the curing time of resin significantly. SOLUTION: A through conductor 3 is passed through a dielectric arranged, at a specified interval, with electrodes 20, 21, while being conducted with the electrode on one side. The through conductor penetrates an earth plate 1 without touching it and the dielectric is fixed to the earth plate 1 while conducting therewith at the electrode on the other side. Caps 4u, d each having a recess substantially conforming with the outline of the dielectric 2 and the through conductor 3 are fitted to the upper and lower surfaces of the earth plate 1 and then resin liquid is injected into the space 46 of the caps thus and cured integrally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a feedthrough capacitor for high withstand voltage and a method of manufacturing the same.

[0002]

2. Description of the Related Art A through-type capacitor for high withstand voltage (hereinafter abbreviated as "capacitor") is used as a filter capacitor for a magnetron of a microwave oven, for example.

Conventionally, as an example of the structure of this type of capacitor, the following are shown in an assembly perspective view of FIG. 4 and a vertical sectional view of FIG. First, a ceramic dielectric 53 having two through holes 50a, 50b penetrating vertically and having capacitor electrodes 51a, 51b, 52 disposed on upper and lower end surfaces, respectively, has a substantially elliptical shape in the center. It is attached to a ground plate 55 having an opening 54 formed therein.

The ground plate 55 serves as a base for attachment to a chassis (not shown) of a microwave oven or the like, and the capacitor electrode 52 is formed in an opening 54 of the chassis through a stepped portion 56 stood up. And a dielectric 51 that is electrically connected to the substrate is fixed.

[0005] Conductor pins 58a, 58b pass through the through-holes 50a, 50b via mounting brackets 57a, 57b formed in a stepped annular shape, and are protected by an insulating tube 59, so that the inside of the dielectric 51 is protected. It is arranged through.

[0006] The dielectric 51 and the conductor pins 58 assembled to the ground plate 55 in this manner are formed on both sides of the ground plate 55 (upper and lower surfaces in the drawing) in the form of elliptical cylinders that cover them. Are mounted and fixed such that the insulating cases 60u and 60d are fitted to the stepped portions 56. The insulating cases 60u and 60d are filled with an insulative resin material such as an epoxy resin or the like, and are cured.
u, 61d were formed.

[0007]

However, the above-mentioned conventional capacitor has the following problems. That is, in such an element structure in which the proportion of the resin mold 61 that is filled and solidified is large, dust and dust tend to adhere due to high temperature, high humidity, and generation of static electricity and magnetic force. For this reason, a gap or a crack is easily generated at a joint boundary with the resin mold 61, and water or oil or the like permeates from the boundary or an electrode is peeled off, which often causes a failure that causes insulation failure. This not only causes deterioration of the withstand voltage, but also causes a short circuit and a fire.

Therefore, in order to avoid this, a step 56 is formed in the opening 54 of the ground plate 55 as shown in the above-mentioned conventional example so that a gap or a crack is hardly generated, but it is not perfect.

Also, in the manufacturing process of the above-mentioned conventional capacitor, the dielectric 5
1. A configuration in which the periphery of the conductor pin 58 is covered with vertically open elliptical cylindrical insulating cases 60u and 60d, and the opening is filled with an insulating resin material to a required position and cured while maintaining this state. Therefore, a lot of time was required for the curing.

As a result, the manufacturing time per unit becomes long and the number of manufactured units per unit time cannot be increased, so that there is a limit to the reduction in product cost.

[0011]

Accordingly, the present invention has been made in view of the above problem, and by reducing the proportion of a resin mold filled and solidified in the entire capacitor, the mechanical strength of the capacitor is ensured and the reliability of the product is improved. In addition to improving the performance, the cap is covered almost entirely on both sides of the ground plate, and the insulating resin is injected into the internal space and cured, thereby reducing the amount of resin material used and curing time of the resin. To provide a novel feed-through capacitor for high withstand voltage and a method for manufacturing the same for the purpose of greatly reducing the time required for improving the production efficiency.

[0012]

In order to achieve the above object, a feed-through capacitor for high withstand voltage according to the present invention is configured as follows.

That is, a dielectric having electrodes disposed at predetermined intervals, a penetrating conductor penetrating through the dielectric by conducting with an electrode on one side of the dielectric, and a non-contacting penetrating conductor. An earth plate to which a dielectric is attached in a conductive state with the electrode on the other side of the dielectric, and a dielectric and / or a through conductor arranged in a protruding shape on both surface sides of the earth plate. An insulating cap covered so as to cover the whole except for the vicinity of the tip end of the through conductor, and an insulating resin mold injected into the internal space of the cap and hardened and integrated. It is characterized by the following.

Further, when the crown body is attached to the ground plate, a fitting means is formed on the ground plate to fit the crown body. Furthermore, in the means for fitting to the ground plate, a continuous concave or convex line is formed around the position where the dielectric of the ground plate is attached, and the edge of the crown is fitted to this. It is characterized by having done.

Further, the concave shape inside the crown body is
It is characterized in that it is formed into a shape substantially learned from the shape of the convex portion of the portion to be covered. Also, if a resin flow hole having a size that allows the flow of the insulating resin material in the flowing state is arranged and formed on the ground plate where the crown body covers, the resin materials on both sides are integrated after curing. Has the effect of improving the strength.

Next, the feedthrough capacitor for high withstand voltage having such a structure is a dielectric having a through conductor in which a through conductor electrically connected to one electrode of a dielectric having electrodes disposed at a predetermined interval is provided. Is attached to a conductive earth plate having a predetermined shape so as to be in conduction with the electrode on the other side of the dielectric,
Of the dielectric and / or penetrating conductor arranged in a protruding shape on both sides of the ground plate, respectively, the insulating cap is covered so as to cover the whole except for the vicinity of the tip of the penetrating conductor,
Next, an insulative resin material is injected into the internal space of the crowned body and cured and integrated to produce the product.

[0017]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of the embodiment, and FIG. 2 is a perspective view showing the assembled state with a part cut away. FIG. 3 is a sectional view taken along line AA of FIG.

Reference numeral 1 denotes a ground plate formed of a conductive material such as a substantially rectangular metal plate, and serves as a mounting board for the capacitor. At the center thereof, two circular through-holes 10 are formed so as to be arranged independently of each other. Further, the two through holes 10,
A plurality of resin circulation holes 11 are arranged around the periphery of the resin circulation hole 10. The resin flow holes 11 are arranged and formed in an appropriate shape such as a long hole shape.

On the upper surface of the earth plate 1, a continuous groove 12 having a predetermined depth is formed by a press or the like so as to surround the outer periphery of the resin circulation hole 11. This groove 1
2 is a concave stripe 12a when viewed from above, and a convex stripe 12b when viewed from below.

Reference numeral 2 denotes a dielectric, which is formed of a ceramic material or the like and is formed in an elongated column shape, and two upper electrodes 20 are formed on the upper surface thereof and are separated from each other. , A lower electrode 21 is formed substantially on the front surface. The configuration of the upper electrode 20 and the lower electrode 21 exerts a capacitor function. Such an electrode 20,
Reference numeral 21 is formed by attaching a thin metal plate, attaching a metal sheet, depositing metal, or printing an electrode material.

The dielectric 2 has two through conductors 3, 3
Are penetrated and spaced apart from each other. The penetrating conductor 3 has a rod-shaped conductor pin 30 penetratingly disposed with its lower end protruding downward, and an upper end of the dielectric 6 on an upper end of the conductor pin 30. And a tab terminal 32 in the form of a flat tongue connected to the electrode 20 via a spacer 31 in the form of a metal disk that is electrically connected to the electrode 20.

With the above structure, the dielectric 2 is assembled to the ground plate 1 by inserting the conductor pins 30 protruding from the lower end surface of the dielectric 2 through the through hole 2 in a non-contact manner, and connecting the lower electrode 21 and the ground plate. 1 is fixed by bonding with solder or the like.

Next, the crown body will be described. Reference numeral 4 denotes a crown member made of a heat-resistant resin molded product that covers the dielectric 2 and the through conductor 3 attached to the ground plate 1 from both sides of the ground plate 1, and includes an upper crown member 4u and a lower crown member. Crowned body 4
d.

The upper cap body 4u is formed in a bottomed long cylindrical shape which is open downward, and its lower edge 41u is inserted and fitted into the groove 12a of the groove 12 of the earth plate 1 so that It is attached so that the dielectric 2 and the vicinity of the tip of the tab terminal 32 are exposed on the upper surface side.

The concave shape 45 inside the upper crown 4u
u is formed into a shape substantially similar to the shape of the convex portion of the portion to be covered (the entirety of the dielectric 2 except for the vicinity of the tip end of the tab terminal 32), and a small resin-filled void 46u is formed when the crown is covered. Is formed.

Further, the thickness of the cover plate 42u of the upper crowned body 4u is increased to increase the distance between the spacer 31 and the terminal hole 43u extending upward along the tab terminal 32. Although the terminal hole 43u has a function of positioning and holding the tab terminal 32 by gripping the tab terminal 32, a certain gap is formed so as to function as an air vent when injecting the resin liquid. It may be.

Further, near the center of the cover plate 42u, an injection hole 44u communicating with the resin filling space 46u is provided. On the other hand, the lower crowned body 4d is formed in a long cylindrical shape with an open top and a bottom, and its upper edge 41d is fitted to the outer peripheral edge of the ridge 12a on the lower surface side of the ground plate 1 to form a ground plate. 1 is attached to the lower surface.

Recessed shape 45d inside lower cap 4d
Is formed so as to have a shape substantially conforming to the shape of the convex portion of the portion to be covered (the entirety of the protruding ridge 12a except for the vicinity of the tip of the conductor pin 30), and is formed so that a slight resin-filled void 46d is formed when the crown is covered. Have been.

Further, the thickness of the lid plate 42d of the lower cap 4d is made thicker, so that the distance of the pin hole 43d extending downward along the conductor pin 30 is increased. In addition, this pin hole 43
d is that the conductor pin 30
Although it has a function of positioning and holding, a certain gap may be formed so as to function as an air vent when injecting the resin liquid.

Further, an injection hole 44d communicating with the resin filling space 46d is provided near the center of the cover plate 42d. The resin mold 5 is filled in the resin filling gaps 46u and 46d. That is, the injection hole 44
The thermoplastic or thermosetting resin liquid poured from u and 44d passes through the resin flow holes 11, 11... disposed around the through-hole 10, and spreads over the upper and lower sides of the ground plate 1. , And the grounding plate 1
The dielectric 2, the upper crown 4u, and the lower crown 4d are integrated via the resin mold 5.

The resin may be injected into the resin-filled voids 46u and 46d and cured one by one on the ground plate 1. That is, first, a resin liquid is injected from the injection hole 44u into the resin-filled gap 46u of the upper crowned body 4u and cured, and then the lower crowned body 4d is turned over so as to be on the upper side of the ground plate 1, and Resin-filled void 46d of crowned body 4d
It may be performed in two stages so that the resin liquid is injected from the injection hole 44d and cured.

With the above configuration, in this embodiment, the amount of resin injected into the resin filling gaps 46u and 46d is significantly smaller than the amount of resin injected into the vertically open insulating case 60 as shown in the above-described conventional configuration. And the curing time also varied greatly. According to the embodiment of the applicant, in the conventional configuration, it takes about one to completely cure the injected resin.
In the present configuration, sufficient curing could be obtained in about 30 minutes, while 5 hours were required.

[0033]

[Other Embodiments] In this embodiment, two through conductors 3 are arranged to penetrate one dielectric 2, but the present invention is not limited to this. It may be formed.

The resin flow holes 1 formed in the ground plate 1
The elements 1, 11,... Are for integrating the resin molds 5 arranged on both sides of the ground plate 1, but are not essential components, and are provided if there is a defect in the electrical characteristics. You don't have to.

[0035]

According to the above configuration, the present invention has the following effects. That is, since the resin flow holes are provided in the ground plate to make the resin molds on both sides integral with each other, and the resin flow holes substantially continuously surround the through holes, a contact boundary between the resin mold and the ground plate is provided. It is possible to avoid the penetration phenomenon of water or the like that occurs on the surface, and it is possible to prevent insulation failure that occurs when the phenomenon reaches the dielectric.

Further, since the crowned body having the upper and lower plate thicknesses and the resin mold are integrated with each other, the mechanical strength against external force acting on the tab terminals and the conductor pins can be improved. Because the volume of the internal space is reduced, the volume of the resin mold can be reduced,
The productivity of the capacitor can be dramatically improved. By reducing the amount of the resin, the time required for curing the resin is short, the stress on the components during the curing of the resin is less likely to act, and it is possible to contribute to the suppression of the deterioration with time of the capacitor.

Further, the attachment of the dielectric to the ground plate is based on the fitting of the through hole and the reduced diameter portion of the dielectric. Therefore, the positioning can be easily performed and the mounting can be performed reliably, which also contributes to the improvement of the production efficiency.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing an assembled state of the embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an assembled perspective view showing a conventional example.

FIG. 5 is a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground plate 10 Through-hole 11 Resin circulation hole 12 Groove part 2 Dielectric 20 Upper electrode 21 Lower electrode 3 Penetrating conductor 4 Covered body 4u Upper crowned body 45u Concave type 46u Resin filling gap 4u Lower crowned body 45d Concave type Shape 46d Resin-filled void 5: Resin mold

Claims (6)

[Claims] 1. A dielectric having electrodes disposed at predetermined intervals, a through conductor provided to penetrate through the dielectric by being electrically connected to an electrode on one side of the dielectric; An earth plate to which a dielectric is attached in a conductive state with the electrode on the other side of the dielectric, and a dielectric and / or a penetrating conductor arranged on both sides of the earth plate so as to protrude, respectively. An insulative cap covering the entire surface of the through conductor except for the vicinity of the tip, and an insulative resin mold injected into the internal space of the cap and hardened and integrated. A through-type capacitor for high withstand voltage characterized by the following. 2. The high withstand voltage device according to claim 1, wherein, when the crown body is attached to the ground plate, a fitting means is formed on the ground plate to fit the crown body. Feedthrough capacitor. 3. A grounding plate fitting means, wherein a continuous concave or convex ridge is formed around a position where a dielectric of the grounding plate is mounted, and an edge portion of the crowned body is fitted to the concave or convex ridge. 3. The feedthrough capacitor for high withstand voltage according to claim 2, wherein: 4. The high withstand voltage penetration type capacitor according to claim 1, wherein the concave shape inside the crowned body is formed into a shape substantially similar to a convex shape of a portion to be covered. 5. A resin circulation hole having a size through which an insulative resin material in a flowing state can be arranged is formed in a ground plate in a portion covered by a crown body. Or a feed-through capacitor for high withstand voltage according to 4. 6. A dielectric formed by penetrating through-hole conductors electrically connected to electrodes on one side of a dielectric on which electrodes are disposed at a predetermined interval, is provided on a conductive ground plate having a predetermined shape.
Attached so as to be in conduction with the electrode on the other side of the dielectric, leaving the vicinity of the tip of the penetrating conductor out of the dielectric and / or penetrating conductor arranged respectively on both sides of the ground plate in a projecting manner. Characterized in that an insulating cap is covered so as to cover the whole body, and then an insulating resin material is injected into an internal space of the cap to be integrated by curing. Manufacturing method of feedthrough capacitor.