JPH0715127Y2 - High voltage capacitor and magnetron - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a magnetron having a high-voltage capacitor and a filter including the high-voltage capacitor, in which an insulating resin layer containing a resin as a main component is integrated on a grounding metal fitting. , A high-voltage capacitor structure in which an electrode portion is provided in the middle portion of a through conductor that penetrates the insulating resin layer and the grounding metal and has both ends led to the outside, and a capacitor is formed between the electrode portion and the grounding metal by the insulating resin layer. By so doing, it is possible to provide a high-voltage capacitor and a magnetron which are less likely to cause a withstand voltage failure, have high reliability, and are inexpensive.

<Prior Art> FIG. 7 is an exploded perspective view of a conventional high voltage capacitor of this type, and FIG.
Penetrating porcelain capacitor 1 having electrodes 4 and 5 and a common electrode 6 which are independent of each other on both sides of which 3 is opened at intervals
Of the common electrode 6 is fixed to the floating portion 71 of the grounding metal 7 by means such as soldering, and the insulating tube 9 is passed through the through holes 2 and 3 of the through ceramic capacitor 1 and the through hole 8 of the grounding metal 7. , Through the through conductors 11, 12 covered,
The through conductors 11 and 12 are fixedly attached to the electrode connecting bodies 13 and 14 which are fixed to the electrodes 4 and 5 of the through ceramic capacitor 1 by soldering.

The grounding metal 7 is formed by drawing a metal plate material such as an iron plate to form a flat outer peripheral edge 72 at an intermediate portion on one surface side.
A protruding portion 71 that rises at an appropriate height is projected, and an insulating case 17 is attached to the outer periphery of the rising portion 71 so as to surround the through-hole porcelain capacitor 1, and the through conductor is provided on the other surface side. An insulating cover 18 is attached so as to surround 11 and 12. Then, the inside and outside of the through-hole porcelain capacitor 1 surrounded by the insulating case 17 and the insulating cover 18 are filled with an externally filled insulating resin 15 and an internally filled insulating resin 16 made of epoxy resin or the like to ensure moisture resistance and insulation. is there.

Terminal portions 111 and 121 such as Faston tab connectors are formed at the ends of the through conductors 11 and 12 on the insulating case 17 side. The terminal portions 111 and 121 are arranged so as to project to the outside of the insulating case 17. The insulating case 17 is generally formed in a tubular shape using a thermoplastic insulating resin such as PBT.

FIG. 9 is a partial sectional view of a conventional magnetron incorporating the above-mentioned conventional high-voltage capacitor as a filter.
Is a cathode stem, 20 is a filter box, 21 and 22 are inductors, and 23 is a high-voltage capacitor used as a filter together with the inductors 21 and 22. The filter box 20 is arranged so as to cover the cathode stem 19, and the high voltage capacitor 23 is provided so as to pass through the through hole provided in the side plate 201 of the filter box 20 so that the insulating case 17 is exposed to the outside. The grounding metal 7 is attached and fixed to the side plate 201 of the filter box 20. Inductor 2
1, 22 inside the filter box 20, the cathode terminal of the cathode stem 19, the through conductor 11 of the high-voltage capacitor 23,
12 and 12 are connected in series. 24 is a magnet, 25 is a cooling fin, 26 is a gasket, and 27 is an RF output end.

<Problems to be Solved by the Invention> However, the conventional high-voltage capacitor has the following problems because the through-porcelain capacitor 1 is used.

(A) It is essential to fill the insulating resin 15 and 16 around the through-hole porcelain capacitor 1 to ensure moisture resistance and electrical insulation. However, the through-hole porcelain capacitor 1 and the insulating resin 15, 16
It is difficult to make the coefficients of thermal expansion completely match, no matter how the material is selected, and it is also difficult to bond them so as not to cause peeling. For this reason, there is a problem that peeling occurs at the contact interface between the through-hole porcelain capacitor 1 and the insulating resins 15 and 16, which easily causes a withstand voltage defect.

(B) Since the insulating resin 15 and 16 are filled around the through-hole porcelain capacitor 1, there is a limit to downsizing of the shape and simplification of the assembling process.

(C) Since the through-hole porcelain capacitor 1 is used, the cost becomes high.

Further, the magnetron using the above-mentioned high voltage capacitor also has the above-mentioned problems.

An object of the present invention is to solve the above-mentioned conventional problems, and to provide a high voltage capacitor and a magnetron which are excellent in withstand voltage characteristics, have high reliability, and are small in size and inexpensive.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, a high voltage capacitor according to the present invention comprises a grounding metal having a floating portion, an insulating resin layer integrated on one surface of the floating metal of the grounding metal, and the insulating resin layer. Through the inside of the through hole provided in the raised portion of the grounding metal in a non-contact state so that both ends are led out to the outside, and the insulating resin is formed between the grounding metal and the middle part. A through conductor having an electrode portion forming a capacitor having a layer as a capacitance layer, and an insulating coating layer, wherein the insulating coating layer is the other side of the grounding metal member opposite to the one surface side of the floating portion. The through conductor is tubularly covered on the surface side and is provided so as to extend to the outside of the floating portion of the grounding fitting, and is made of the same material as the insulating resin, and the through hole of the grounding fitting is provided. Through the inside to the insulating resin layer It is characterized by being continuous.

Further, the magnetron according to the present invention is characterized in that the above high voltage capacitor is used as a filter.

<Operation> The high-voltage capacitor according to the present invention penetrates through the insulating resin layer integrated on the grounding metal fitting, and further penetrates the grounding metal fitting in a non-contact state so that both ends of the through conductor are led out to the outside. Since the through conductor has an electrode portion in the middle thereof to form a capacitor with an insulating resin layer between the electrode portion and the grounding metal, the insulating resin layer functions as a capacitor portion. Unlike in the past, a through-hole porcelain capacitor is unnecessary. For this reason, there is no room for peeling at the contact interface between the porcelain capacitor and the insulating resin, and a resulting failure in withstand voltage, and a highly reliable high-voltage capacitor and magnetron can be obtained. Moreover, since the through-hole porcelain capacitor is not used and the insulating resin layer is used, miniaturization is easy. Furthermore, since the inexpensive insulating resin layer is used as a capacitor, the cost is low.

The insulating resin layer has a lower dielectric constant than the dielectric ceramic. However, the performance of the recent magnetron has been improved, and a capacitor of several hundred PF has been conventionally required as a filter capacitor, but a capacitor of several tens of PF is now sufficient. Therefore, even a high-voltage capacitor using an insulating resin layer can sufficiently withstand use as a magnetron filter.

The insulating coating layer is provided so as to cover the through conductor in a tube shape on the other surface side opposite to the one surface side of the floating portion of the grounding metal and to extend to the outside of the floating portion of the grounding metal. A sufficiently large creepage distance can be secured between the grounding metal and the through conductor, and the withstand voltage characteristic can be improved. Therefore, a high-reliability high-voltage capacitor having excellent withstand voltage characteristics can be obtained.

Moreover, since the insulating coating layer is continuous with the insulating resin layer through the through hole of the grounding fitting, the through conductor is completely covered with the continuous insulating resin having no break. For this reason, there is no room for movement of the insulating coating layer on the through conductor, breaks, and the like, and it is possible to obtain a withstand voltage characteristic superior to that of the conventional insulating tube coating.

Further, since the insulating coating layer is the same material as the insulating resin layer,
It can be formed by the same process as the insulating resin layer. Therefore, the number of manufacturing steps can be reduced and the manufacturing cost can be reduced as compared with the conventional technique that requires an insulating tube mounting step in addition to the insulating resin casting step.

Furthermore, since the insulating coating layer covers the through conductor in a tube shape, the amount of insulating resin required to insulate the through conductor from the grounding metal inside the floating portion is extremely small. Specifically, in the conventional case, the amount of insulating resin that fills the entire inside of the floating portion was required, but the thickness of the tube and the amount of insulating resin corresponding to the length are sufficient. Therefore, it is possible to obtain a high-voltage capacitor that is lightweight and inexpensive.

<Embodiment> FIG. 1 is an exploded perspective view of a high-voltage capacitor according to the present invention,
2 is a perspective view of the same, and FIG. 3 is a partial front sectional view of the same. 28 is a grounding metal, 29 is an insulating resin layer, 30 and 31 are through conductors, 32 and 33 are insulating coating layers that cover the through conductors 30 and 31, and
34 is an insulating case.

As in the conventional case, the grounding fitting 28 has a raised portion 281 that rises at an appropriate height from the flat outer peripheral edge 282 by subjecting a metal plate material such as an iron plate to a drawing process. 2
Reference numerals 83 and 284 are through holes provided at intervals in the floating portion 281.

The insulating resin layer 29 is integrally fixed on the surface of the floating portion 281 of the grounding fitting 28. The insulating resin layer 29 can be made of a thermosetting resin or a thermoplastic resin which is a polymer resin, or a composite resin in which dielectric ceramic powder is mixed with these resins. The insulating resin layer 29 can also be composed of a composite resin in which a magnetic powder such as ferrite powder is mixed with the resin,
In this case, it is possible to obtain not only the capacitance but also the inductance so that an excellent filter action can be obtained.

The penetrating conductors 30 and 31 penetrate the insulating resin layer 29, further penetrate the penetrating holes 283 and 284 of the grounding fitting 28 in a non-contact state, and both ends thereof are led out to the outside. Collar-shaped electrode portions 301 and 311 are provided in the middle portion of the through conductors 30 and 31 embedded in the insulating resin layer 29, and the surface of the electrode portions 301 and 311 and the floating portion 281 of the grounding metal fitting. A capacitor is formed by the insulating resin layers 291 and 292 interposed between and. 302 and 312 are terminal parts such as faston tab connectors. Terminals 302 and 312 are insulated cases
It is arranged so as to project to the outside of 34.

The insulating coating layers 32 and 33 are formed as a part of the insulating resin layer 29. The insulating case 34 is formed using a thermoplastic insulating resin such as PBT, and is attached to the outer periphery of the raised portion 281 so as to surround the insulating resin layer 29.

As described above, the high-voltage capacitor according to the present invention uses the insulating resin layer 29 as a capacitance layer, and unlike the conventional art, does not require a through-hole porcelain capacitor. For this reason, there is no room for peeling at the contact interface between the porcelain capacitor and the insulating resin, and a resulting failure in withstand voltage, and a highly reliable high voltage capacitor can be obtained. Further, since the through-hole porcelain capacitor is not used and the insulating resin layer 29 is used, miniaturization is easy. Furthermore, since the inexpensive insulating resin layer 29 is used as a capacitor, the cost is low.

The insulating coating layers 32 and 33 cover the through conductors 30 and 31 in a tube shape on the other surface side opposite to the one surface side of the floating portion of the grounding fitting 29, and extend to the outside of the floating portion of the grounding fitting 28. It is provided so as to extend. With such a structure,
A sufficiently large creepage distance can be secured between the grounding fitting 28 and the through conductors 30 and 31 to improve the withstand voltage characteristics.

The insulating coating layers 32 and 33 are further continuous with the insulating resin layer 29 through the through holes of the grounding fitting 28. With this structure, the through conductors 30 and 31 are continuous insulating resin 39 without breaks,
It is completely covered by 32 and 33. Therefore, the through conductor
There is no room for movement, breaks, etc. of the insulating coating layers 32, 33 on the layers 30, 31, and a withstand voltage characteristic superior to that of the conventional insulating tube coating can be obtained.

The insulating coating layers 32 and 33 are made of the same material as the insulating resin layer 29. Therefore, it can be formed in the same process as the insulating resin layer 29.
Therefore, the number of manufacturing steps can be reduced and the manufacturing cost can be reduced as compared with the conventional technique that requires an insulating tube mounting step in addition to the insulating resin casting step.

Furthermore, since the insulating coating layers 32 and 33 cover the through conductors 30 and 31 in a tube shape, the amount of insulating resin required to form the insulating coating layers 32 and 33 can be suppressed to a necessary minimum. Specifically, in the conventional case, the amount of insulating resin that fills the entire inside of the floating portion was required (see FIG. 8), but the thickness of the tube and the amount of insulating resin corresponding to the length are sufficient. Therefore, it is possible to obtain a high-voltage capacitor that is lightweight and inexpensive.

FIG. 4 is an exploded perspective view of another embodiment of the high voltage capacitor according to the present invention, and FIG. 5 is an assembled sectional view of the same. The same reference numerals as those in FIGS. 1 to 3 denote the same components. The feature of this embodiment is that the through conductor 30,
31 electrode parts 301 and 311 are formed in a cylindrical shape, and a grounding metal
That is, cylindrical electrode portions 285 and 286 that are coaxially opposed to the cylindrical electrode portions 301 and 311 and that are cylindrically opposed to each other are continuously provided on the surface of the floating portion 281 of 28. Between the electrode portion 301 of the through conductor 30 and the electrode portion 285 of the ground metal fitting 28, and between the electrode portion 311 of the through conductor 31 and the electrode portion 286 of the ground metal fitting 28, a ring-shaped insulating resin layer 291, respectively. 292 serves as a capacitance layer to form a capacitor. Therefore, the area where the electrodes face each other increases, and the acquisition capacity increases.

FIG. 6 is a partial cutaway view of a magnetron using the high voltage capacitor according to the present invention as a filter. In the figure, the same reference numerals as those in FIG. 9 denote the same components. Reference numeral 35 is a high voltage capacitor according to the present invention.
The high-voltage capacitor 35 is attached to the side plate 20 of the filter box 20.
An insulating case 34 is provided so as to extend to the outside through a through hole provided in 1, and is attached and fixed to the side plate 201 of the filter box 20 at the grounding metal fitting 28 portion.

<Effects of the Invention> As described above, according to the present invention, it is possible to provide a high-voltage capacitor and a magnetron which are excellent in withstand voltage characteristics, have high reliability, and are small in size and inexpensive.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a high voltage capacitor according to the present invention,
2 is a perspective view of the same, FIG. 3 is a front sectional view of the same, FIG. 4 is an exploded perspective view of another embodiment of the high-voltage capacitor according to the present invention, and FIG. 5 is a front sectional view of the same. FIG. 6 is a partially broken sectional view of a magnetron incorporating a high voltage capacitor according to the present invention, FIG. 7 is an exploded perspective view of a conventional high voltage capacitor, FIG. 8 is a front partial sectional view of the same, and FIG. 9 is a conventional sectional view. FIG. 3 is a partial cutaway view of a magnetron incorporating the high voltage capacitor of FIG. 28 …… Grounding metal 29 …… Insulating resin layer 30, 31 …… Penetrating conductor 301,311 …… Electrode part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-50-85853 (JP, A) JP-A-55-148308 (JP, A) Actually open 62-175648 (JP, U) Actual-open Sho 63- 19743 (JP, U)

Claims (4)

[Scope of utility model registration request] 1. A grounding metal fitting having a floating portion, an insulating resin layer integrated on one surface of the floating metal fitting of the grounding metal fitting, and a floating metal fitting penetrating through the insulating resin layer An electrode that penetrates the inside of the through hole provided in the rising portion in a non-contact state and has both ends led to the outside, and forms a capacitor having the insulating resin layer as a capacitance layer with the ground metal fitting in the middle portion. A high-voltage capacitor including a through conductor having a portion, and an insulating coating layer, wherein the insulating coating layer has the through conductor on the other surface side opposite to the one surface side of the floating portion of the grounding fitting. It is provided so as to be covered in a tubular shape and extends to the outside of the floating portion of the grounding fitting, and is made of the same material as the insulating resin, and passes through the through hole of the grounding fitting to provide the insulating resin. Characterized by being continuous in layers High voltage capacitor that. 2. The utility model registration claim wherein the insulating resin layer is made of a thermosetting or thermoplastic resin or a composite resin in which dielectric ceramic powder is mixed with these resins. The high-voltage capacitor described in the item. 3. The utility model registration claim 1, wherein the insulating resin layer is composed of a thermosetting resin or a composite resin in which magnetic powder is mixed with the thermosetting resin. The high-voltage capacitor according to item 2. 4. A magnetron having a filter composed of a high voltage capacitor, wherein the high voltage capacitor is a utility model registration claim.
2. A magnetron as described in any one of items 1 to 3.