JP2580628Y2 - High voltage capacitors and magnetrons - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetron having a high-voltage capacitor and a filter comprising the high-voltage capacitor.

[0002]

2. Description of the Related Art As a conventional high-voltage capacitor of this type, for example, as shown in Japanese Utility Model Publication No. 1-18838 and Japanese Utility Model Publication No. 63-48112, two through holes are provided in one through capacitor. Formed at an interval, provided on each side of the through-hole opened a separate electrode independent of each other and a common electrode common to the individual electrodes, the common electrode,
It is fixed on the floating portion of the grounding metal by means such as soldering, and a through conductor covered with an insulating tube is passed through the through hole of the through capacitor and the through hole of the grounding metal. On the individual electrodes of
The twin type soldered using an electrode connector or the like is the best known. The grounding metal has a floating part protruding at the center or the central part on one side, and an insulating case is inserted around the floating part so as to surround the feedthrough capacitor, and a penetrating conductor is formed on the other side. An insulating cover is inserted so as to surround the. A thermosetting insulating resin such as an epoxy resin is filled inside and outside of the feedthrough capacitor surrounded by the insulating case and the insulating cover to ensure moisture resistance and insulation.

In a conventional high-voltage capacitor, a thermosetting insulating resin such as an epoxy resin is filled inside a feedthrough capacitor, so that a withstand voltage test, a heat shock test, or a thermal stress or a curing shrinkage stress during use is reduced. It is necessary to alleviate this, and as a means for this, conventionally, an insulating tube made of silicone rubber or the like is covered on the through conductor. Since the insulating tube made of silicone rubber has elasticity, in the withstand voltage test and the heat shock test, the interface peeling between the porcelain body constituting the feedthrough capacitor and the epoxy resin can be prevented.

[0004]

However, the conventional high-voltage capacitor has the following problems. (A) At the contact interface between the feedthrough capacitor and the thermosetting resin such as epoxy resin filled on the outside, a gap due to peeling due to a withstand voltage test, a heat shock test, or a thermal stress or a curing shrinkage stress during use. Alternatively, cracks are generated and the withstand voltage characteristics are deteriorated. (B) Since the through conductor is covered with an insulating tube of silicone rubber or the like inside the through capacitor, the thermal stress and the curing shrinkage stress of the filled thermosetting insulating resin such as epoxy resin can be reduced. However, since it is essential to cover the through conductor with an insulating tube of silicone rubber or the like, there are problems such as an increase in the number of parts, an insertion and assembling operation of the insulating tube, and an increase in the number of assembly operations. there were.

[0005] Therefore, the object of the present invention is to solve the above-mentioned conventional problems, to reduce the number of parts and the number of assembling work steps, and to reliably alleviate the withstand voltage test, heat shock test or thermal stress during use. Another object of the present invention is to provide a low-cost high-voltage capacitor and magnetron.

[0006]

In order to solve the above-mentioned problems, a high-voltage capacitor according to the present invention includes a grounding metal, a through capacitor, a through conductor, an insulating resin, and an insulating case. The grounding metal has a floating portion on one surface side, the floating portion has a hole, the through capacitor has a through hole, and has electrodes on both surfaces where the through hole is opened, One of the electrodes is arranged on the floating portion and is fixed to the floating portion. The through conductor penetrates through the through hole and the hole, and is conductively connected to the other of the electrodes. The insulating resin includes an outer insulating resin and an inner insulating resin, at least one of which is made of urethane resin, wherein the outer insulating resin is filled around the through capacitor on the one surface side of the grounding metal, and the inner insulating resin is Resin is filled in the through hole of the feedthrough capacitor on the other surface side of the grounding metal. The insulation case
Is made of a thermoplastic resin.
Between the outer insulating resin so that the outer insulating resin is exposed.
It is inserted at the upper end of the resin .

[0007] The magnetron according to the present invention is characterized by having the above-mentioned high voltage capacitor.

[0008]

Since at least one of the outer insulating resin and the inner insulating resin is made of urethane resin, at least one side filled with the urethane resin has a withstand voltage due to the elasticity of the urethane resin and the adhesion to the porcelain body. Tests, heat shock tests, or thermal stress during use can be alleviated.

When the inner insulating resin is made of urethane resin, the withstand voltage test, heat shock test or thermal stress during use can be reduced by the elasticity of the urethane resin itself and its adhesion to the porcelain body. There is no need to insert an insulating tube into the device, and the number of parts and the number of assembly operations are reduced.

[0010] In addition, since the urethane resin is inexpensive as compared with the epoxy resin, the overall cost can be reduced. Furthermore, the insulating case is connected between the lower end and the grounding bracket.
Over the outer insulating resin so that the outer insulating resin is exposed between
Since it is inserted on the end side, the insulation conductor
Tracking resistance on the path to the grounding bracket through the surface
The surface of the outer insulating resin 2 made of a thermosetting resin having excellent
Will be issued. Therefore, the insulating case can be made
Substantially thermosetting despite being composed of plastic resin
The same tracking resistance as when using an insulating case
can get.

[0011]

1 is a front sectional view of a high-voltage capacitor according to the present invention, FIG. 2 is a plan view of the same, and FIG. 1 is a grounding bracket, 2 and 3 are feedthrough capacitors,
Reference numerals 4 and 5 denote through conductors, 6 denotes an insulating case, 71 and 72 denote outer insulating resins, 81 and 82 denote inner insulating resins, and 9 denotes an insulating cover.

The grounding bracket 1 has a raised portion 101 on one side,
Floating portions 101 and 102 have holes 103 and 1
04. The through capacitors 2 and 3 are through holes 20
1 and 301, and electrodes (202, 203), (302, 30)
3), are disposed on the floating portions 101 and 102, and the electrodes 203 and 303 are fixed to the floating portions 101 and 102. The through conductors 4 and 5 penetrate through the through holes 201 and 301 and are conductively connected to the electrodes 202 and 302. The through conductors 4 and 5 do not have an insulating tube unlike the related art.

The outer insulating resins 71 and 72 are made of a thermosetting resin such as an epoxy resin or an unsaturated polyester resin, and are filled around the feedthrough capacitors 2 and 3 on one side of the grounding fitting 1.

The inner insulating resins 81 and 82 are made of urethane resin, and the feedthrough capacitors 2 and
3 are filled in the through holes 201, 301, and the through conductors 4,
It covers around 5. With the structure as described above, the withstand voltage test, the heat shock test, or the use during use is made possible by the elasticity of the inner insulating resins 81 and 82 made of urethane resin and the adhesion to the ceramic body constituting the feedthrough capacitors 2 and 3. Thermal stress etc. can be reduced. For this reason, it is not necessary to insert an insulating tube into the through conductors 4 and 5, and the number of parts and the number of assembling work steps can be reduced.

In addition, since the urethane resin is less expensive than the epoxy resin, the overall cost can be reduced. Although not shown, the outer insulating resin 7
1, 72 may be made of urethane resin instead of thermosetting resin such as epoxy resin or unsaturated polyester resin. Thereby, the outer insulating resins 71, 72
In this case, the elasticity of the urethane resin and the adhesion to the porcelain body make it possible to alleviate a withstand voltage test, a heat shock test, thermal stress during use, and the like, and to reduce the cost.

Next, another structure shown in the embodiment will be described. The grounding metal fitting 1 has two raised portions 1 on the same surface side.
01, 102, and each of the raised portions 101, 102 has holes 103, 104 at the center and is arranged at a distance from each other.

There are two through capacitors 2 and 3, each having through holes 201 and 301, and electrodes (202 and 20) on both surfaces where the through holes 201 and 301 are opened.
3), (302, 303), and the floating portions 101, 1
02 and the electrodes 203 and 303 are
1, 102 are fixed by means such as soldering. The feedthrough capacitors 2 and 3 are made of dielectric porcelain.

The through conductors 4 and 5 are connected to the through capacitors 2 and 3
Each is provided so as to penetrate through the inside of the through-holes 201 and 301, and each is individually and electrically connected to the electrodes 202 and 302. The through conductors 4, 5 are provided at the raised portions 101, 1, 1
Both ends are led to the outside through holes 103 and 104 provided in the hole 02 in a non-contact state. Reference numerals 12 and 13 denote electrode fittings for connecting the through conductors 4 and 5 and the electrodes 202 and 302. Tab terminal portions 41 and 51 are provided on the upper end side (in the figure) of the through conductors 4 and 5.

As described above, the grounding metal fitting 1 is
There are two floating portions 101 and 102, and two feedthrough capacitors 2 and 3 are provided.
And electrodes (202, 203) and (302, 303) on both sides where the through holes 201 and 301 are opened.
2 and 302 are fixed to the raised portions 101 and 102, and the through conductors 4 and 5 are provided through the through holes 201 and 301 for each of the through capacitors 2 and 3, and each is provided with an electrode 2.
Since the capacitors 02 and 302 are electrically connected to each other, the capacitor becomes a capacitor-independent high-voltage capacitor, which is less likely to cause a withstand voltage failure than the dual-type high-voltage capacitor, and is small in size and inexpensive.

The insulating case 6 is made of a thermoplastic resin such as polybutylene terephthalate (PBT) or a thermosetting resin such as an epoxy resin.
The outer insulating resins 71 and 72 are inserted between the upper ends of the outer insulating resins 71 and 72 such that the outer insulating resins 71 and 72 are exposed. When the insulating case 6 is made of a thermoplastic resin, the cost is lower than when the insulating case 6 is made of a thermosetting resin such as an epoxy resin or an unsaturated polyester. In the case shown in the figure, the insulating case 6 is inserted on the upper end sides of the outer insulating resins 71 and 72 so that the outer insulating resins 71 and 72 are exposed between the lower end portion 610 and the grounding metal fitting 1. The case 6 is reduced in size and its material cost is reduced.

In addition, the insulating case 6 is inserted between the lower ends 610 and the grounding fitting 1 at the upper ends of the outer insulating resins 71 and 72 so that the outer insulating resins 71 and 72 are exposed. The surfaces of the outer insulating resins 71 and 72 made of a thermosetting resin having excellent tracking resistance are exposed on a path a extending from the conductors 4 and 5 to the grounding fitting 1 through the surface of the insulating case 6. For this reason, despite the fact that the insulating case 6 is made of an inexpensive thermoplastic resin, substantially the same tracking resistance as in the case of using the thermosetting insulating case can be obtained.

The insulating case 6 has two cylindrical portions 61 and 62. The cylindrical portions 61 and 62 are juxtaposed with a space D therebetween, and the upper opening sides of the cylindrical portions 61 and 62 are connected to each other by a connecting portion 64. , Concave portion 6 connected to inner diameter portions 611 and 621
Three. Lower end portions 610, 62 of cylindrical portions 61, 62
Numeral 0 is inserted into upper end portions of the outer insulating resins 71 and 72.

As described above, since the upper opening sides of the two cylindrical portions 61 and 62 are connected to each other and the lower opening sides are inserted into the outer insulating resins 71 and 72, the insulating case 6 is vertically moved. An integrally connected assembly structure is obtained. Therefore, the feedthrough capacitors 2, 3 and the feedthrough conductor 4,
The mechanical reinforcement of the through conductor 5 increases, and the through conductors 4 and 5 are less likely to be uneven. As a result, the through conductors 4 and 5, the through capacitors 2 and 3 and the grounding metal 1, and the outer insulating resin 7
Interfacial delamination hardly occurs between the first and second layers, and the withstand voltage characteristics are improved.

The insulating case 6 includes two cylindrical portions 61,
Since the upper opening side of 62 has the concave portion 63 connected to the inner diameter portions 611 and 621, the outer insulating resins 71 and 72 can be simultaneously cast into the two cylindrical portions 61 and 62 through the concave portion 63. For this reason, the number of insulating resin casting steps is reduced by half, and cost reduction is achieved. When casting the outer insulating resins 71 and 72, a casting case is disposed between the insulating case 6 and the grounding metal 1 as described later.

The outer insulating resins 71 and 72 are substantially independently filled around the feedthrough capacitors 2 and 3 with a space D therebetween. Therefore, the outer insulating resin 71 and the cylindrical portion 6
1 and the outer insulating resin 72 and the cylindrical portion 62
The space 14 defined by the space D serves as a heat radiation area, and the thermal stress applied during mounting in a microwave oven, a heat cycle test or the like is reduced, and a withstand voltage failure or the like is less likely to occur.

Inner insulating resin 81, 8 made of urethane resin
Reference numeral 2 is filled in a region on the opposite side with the grounding fitting 1 interposed therebetween. The inner insulating resins 81 and 82 are separated from each other by a partition 91 provided on the insulating cover 9. For this reason, the mutual thermal stress interference action of the inner insulating resins 81 and 82 is divided by the partition portion 91, and the through conductor 4
5 and the insulating cover 9 and the inner insulating resins 81 and 82 are less likely to peel off at the interface.

FIG. 4 is a partial sectional view of a magnetron incorporating a high-voltage capacitor according to the present invention as a filter.
15 is a cathode stem, 16 is a filter box, 17, 1
8 is an inductor, and 19 is a high voltage capacitor according to the present invention used as a filter together with the inductors 17 and 18. The filter box 16 is disposed so as to cover the cathode stem 15, and the high-voltage capacitor 19 is provided through a through hole provided in the side plate 161 of the filter box 16 so that the insulating case 6 is exposed to the outside. The grounding bracket 1 is attached to and fixed to the side plate 161 of the filter box 16. Inductor 17, 1
Reference numeral 8 is connected in series between the cathode terminal of the cathode stem 15 and the through conductors 4 and 5 of the high-voltage capacitor 19 inside the filter box 16. 20 is a magnet, 2
1 is a cooling fin, 22 is a gasket, and 23 is an RF output terminal.

FIGS. 5 and 6 show an example of a manufacturing process of the high-voltage capacitor according to the present invention shown in FIGS.
As shown in FIG. 5, a casting case 24 is arranged on the grounding metal 1 so as to surround the feedthrough capacitors 2 and 3. The casting case 24 is made of polypropylene or the like. The contact portion between the casting case 24 and the grounding fitting 1 is sealed by mechanical fitting, bonding with an adhesive, or the like. An insulating case 6 is provided at the upper end of the casting case 24.
Insert.

Next, as shown in FIG. 6, outer insulating resins 71 and 72 are filled in an inner space surrounded by the insulating case 6 and the casting case 24. Inner insulating resin 81, 8
2 is filled before or after the outer insulating resins 71 and 72 are filled.

Thereafter, the casting case 24 is peeled off to obtain the high-voltage capacitor according to the present invention shown in FIGS.

FIG. 7 is a sectional view showing another embodiment of the high-voltage capacitor according to the present invention. In this embodiment, the cylindrical portions 61 and 62 of the insulating case 6 are elongated and inserted into the outer peripheral portions of the raised portions 101 and 102 of the grounding fitting 1.

The present invention can be applied to a well-known double type. FIG. 8 shows an example. In the figure, one through capacitor 210 has two through holes 2
11 and 212 are formed at intervals, and the through holes 211 and 2 are formed.
The individual electrodes 21 which are independent from each other are provided
3, 214 and the individual electrodes 213, 214 are provided with a common electrode 215. The common electrode 215 is fixed to the floating portion 111 of the grounding metal fitting 110 by means such as soldering. Through hole 21
1, 212 and the through-holes of the grounding fitting 110, the through-conductors 4, 5 having no insulating tube are made to penetrate.
1 and 212 are soldered using electrode connecting bodies 12 and 13 and the like. The grounding metal fitting 110 has a floating portion 111 protruding on one surface side, and an insulating case 60 is inserted around the floating portion 111 so as to surround the feedthrough capacitor 210. , 5 are surrounded by an insulating cover 9. Then, the feedthrough capacitor 210 surrounded by the insulating case 60
Is filled with a thermosetting insulating resin 70 such as an epoxy resin and the inside of the insulating cover 9 is filled with an inner insulating resin 80 made of urethane resin.

FIG. 9 is a graph showing heat shock test data. Sample 1 is a conventional product in which an insulating tube made of silicone rubber is inserted into a through conductor and an epoxy resin is filled as an inner insulating resin. Sample 2 is an epoxy resin used as an inner insulating resin without inserting an insulating tube made of silicone rubber in a through conductor. The sample 3 filled with resin corresponds to the product of the present invention, in which the through-conductor is filled with urethane resin as the inner insulating resin without passing through an insulating tube made of silicone rubber. Heat shock test is-
One cycle of 40 ° C. for 1 hour and 120 ° C. for 1 hour was performed, and an AC withstand voltage test was performed every 10 cycles of this pattern.

As is clear from the test data shown in FIG. 9, Sample 3 of the present invention has heat shock resistance comparable to that of Sample 1 of the prior art. Do not insert an insulating tube made of silicone rubber into the through conductor.
Sample 2 filled with epoxy resin as inner insulating resin
Causes a pressure resistance failure due to heat shock in about 10 cycles.

[0035]

As described above, the high-voltage capacitor according to the present invention is a high-voltage capacitor having a grounding metal, a through capacitor, a through conductor, and an insulating resin. Has a hole, the floating portion has a hole, the feedthrough capacitor has a through hole, has electrodes on both sides where the through hole is opened, is disposed on the floating portion, One is fixed to the floating portion, the through conductor penetrates through the through hole and the hole, and is conductively connected to the other of the electrodes, and the insulating resin includes an outer insulating resin and an inner insulating resin, and at least One is made of urethane resin, and the outer insulating resin is filled around the feedthrough capacitor on one side of the grounding fitting, and the inner insulating resin is filled in the through hole of the feedthrough capacitor on the other side of the grounding fitting. Of the resin itself Force resistance, by adhesion to porcelain, withstand voltage test, it can reduce thermal stress or the like during heat shock test or use, yet can provide an inexpensive high-voltage capacitor and a magnetron cost. Furthermore,
The high-voltage capacitor according to the present invention includes an insulating case.
And the insulation case is insulated outside between the lower end and the grounding bracket.
Insert the top end of the outer insulating resin so that the resin is exposed.
From the through conductor, through the surface of the insulation case.
Heat hardened with excellent tracking resistance on the route to the metal fittings
That the surface of the outer insulating resin 2 made of
Become. For this reason, the insulating case is made of inexpensive thermoplastic resin.
Despite the fact, the thermosetting insulating case is substantially
The same anti-tracking characteristics as in the case of using the same are obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a high-voltage capacitor according to the present invention.

FIG. 2 is a plan view of the high-voltage capacitor according to the present invention.

FIG. 3 is an external perspective view of the high-voltage capacitor according to the present invention.

FIG. 4 is a partial cutaway view of a magnetron incorporating the high-voltage capacitor according to the present invention.

FIG. 5 is a diagram illustrating an example of a manufacturing process of the high-voltage capacitor according to the present invention.

FIG. 6 is a diagram illustrating an example of a manufacturing process of the high-voltage capacitor according to the present invention.

FIG. 7 is a front sectional view of another embodiment of the high-voltage capacitor according to the present invention.

FIG. 8 is a front sectional view of another embodiment of the high-voltage capacitor according to the present invention.

FIG. 9 is a graph showing heat shock test data.

[Explanation of symbols]

 1, 110 Grounding fittings 101, 102, 111 Floating portions 103, 104, 112 Holes 2, 3, 210 Through capacitor 201, 301, 211, 212 Through hole 202, 203, 213, 214 Electrode 302, 303, 215 Electrode 4 5, through conductor 6, 60 insulating case 71, 72, 70 outer insulating resin 9 insulating cover 81, 82, 80 inner insulating resin

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Isao Fujiwara 1-13-1 Nihonbashi, Chuo-ku, Tokyo Inside TDK Corporation (72) Inventor Makoto Morita 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDK (56) References JP-A-61-15357 (JP, A) JP-A-59-9721 (JP, U) JP-A-60-116226 (JP, U) JP-A-1-19388 (JP, A) Y2) Jiko 63-48112 (JP, Y2) (58) Field surveyed (Int. Cl. ⁶ , DB name) H01G 4/35 H01J 23/15

Claims (4)

(57) [Scope of request for utility model registration] 1. A high-voltage capacitor comprising a grounding metal, a through capacitor, a through conductor, an insulating resin, and an insulating case , wherein the grounding metal has a floating portion on one surface side, and The through-hole capacitor has a hole, the through-capacitor has a through-hole, and has electrodes on both surfaces where the through-hole opens, and is disposed on the floating portion, and one of the electrodes is the floating The through-conductor is penetrated through the through-hole and the hole, is conductively connected to the other of the electrodes, the insulating resin includes an outer insulating resin and an inner insulating resin, At least one is made of urethane resin, the outer insulating resin is filled around the through capacitor on the one surface side of the grounding metal, and the inner insulating resin is filled with the through capacitor on the other surface of the grounding metal. Is filled within the insulating case is made of a thermoplastic resin, the lower end portion
As the outer insulating resin is exposed between the grounding metal,
A high-voltage capacitor inserted into an upper end of the outer insulating resin . 2. The grounding metal fitting has two floating portions, each of which is disposed at an interval from each other, and the two feed-through capacitors are each disposed on the floating portion. The through conductor is provided so as to penetrate through the through hole for each of the through capacitors, each of which is individually electrically connected to the other of the electrodes, and the outer insulating resin is provided for each of the through capacitors. The insulating case has two tubular portions, the tubular portions are juxtaposed at an interval from each other, and the upper opening sides of the tubular portions are connected to each other and connected to the inner diameter portion. 2. The high-voltage capacitor according to claim 1, wherein a lower opening side is inserted into an outer periphery of an upper end side of the outer insulating resin. 3. 3. A magnetron having a filter made of a high-voltage capacitor, wherein the high-voltage capacitor has a grounding metal, a feedthrough capacitor, a feedthrough conductor, an insulating resin, and an insulating case , The grounding metal has a floating portion on one surface side, the floating portion has a hole, the through capacitor has a through hole, and has electrodes on both surfaces where the through hole is opened,
One of the electrodes is fixed to the floating portion, and the through conductor penetrates the through hole and the hole, and is electrically connected to the other of the electrodes, The insulating resin includes an outer insulating resin and an inner insulating resin, at least one of which is made of urethane resin, wherein the outer insulating resin is filled around the through capacitor on the one surface side of the grounding metal, and the inner insulating resin is Resin is filled in the through hole of the feedthrough capacitor on the other surface side of the grounding fitting, the insulating case is made of thermoplastic resin, and a lower end and the
As the outer insulating resin is exposed between the grounding metal,
A magnetron inserted into an upper end of the outer insulating resin . 4. The grounding metal fitting has two floating portions, each of which is arranged at an interval from each other, and the two feed-through capacitors are each arranged on the floating portion. The through conductor is provided so as to penetrate through the through hole for each of the through capacitors, each of which is individually electrically connected to the other of the electrodes, and the outer insulating resin is provided for each of the through capacitors. The insulating case has two tubular portions, the tubular portions are juxtaposed at an interval from each other, and the upper opening sides of the tubular portions are connected to each other and connected to the inner diameter portion. The magnetron according to claim 3, wherein a lower opening side is inserted into an outer periphery of an upper end side of the outer insulating resin.