US20010036053A1 - High voltage capacitor and magnetron - Google Patents
High voltage capacitor and magnetron Download PDFInfo
- Publication number
- US20010036053A1 US20010036053A1 US09/822,340 US82234001A US2001036053A1 US 20010036053 A1 US20010036053 A1 US 20010036053A1 US 82234001 A US82234001 A US 82234001A US 2001036053 A1 US2001036053 A1 US 2001036053A1
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- Prior art keywords
- capacitor
- insulating
- voltage
- grounding member
- insulating case
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/35—Feed-through capacitors or anti-noise capacitors
Abstract
Through conductors pass through a capacitor and a grounding member. Insulating tubes cover the through conductors respectively. An insulating case is provided at one surface of the grounding member. An insulating cover is provided at an opposite surface of the grounding member. Insulating resins fill a space inside the insulating case, a space inside the insulating cover, and a space around the capacitor. The insulating case is constituted of a mixture containing polybutylene terephthalate and an inorganic substance which contains glass powder and ceramic powder. The content of the inorganic substance is set within a range of 15 wt % to 45 wt % relative to the entire quantity of the mixture.
Description
- 1. Field of the Invention
- The present invention relates to a high-voltage capacitor and a magnetron having a filter constituted of the high-voltage capacitor.
- 2. Description of the Related Art
- Well-known examples of high-voltage capacitors of this type in the prior art include those disclosed in Japanese Unexamined Patent Publication No. 1996-316099 and Japanese Unexamined Utility Model Publication No. 1992-40524. They have the following structural features in common. Two through holes are formed over a distance from each other at a dielectric ceramic material to constitute the capacitor. Individual electrodes that are independent of each other and a common electrode to be shared by the individual electrodes are provided at the two surfaces of the dielectric ceramic material at which the through holes open. The common electrode is secured onto a raised portion of a grounding member by a means such as soldering. Through conductors are provided so as to pass through the through holes at the capacitor and through holes formed at the grounding member. The through conductors are soldered to the individual electrodes at the capacitor by using electrode connectors or the like. An insulating case is fitted around the external circumference of the raised portion of the grounding member so as to enclose the capacitor. An insulating cover is fitted on the other side of the grounding member so as to enclose the through conductors. The insulating cover is mounted so that it comes in complete contact with the internal circumferential surface of the raised portion of the grounding member. Then, a thermo-setting insulating resin such as an epoxy resin is charged to fill the space inside the insulating case and outside the capacitor enclosed by the insulating case to assure satisfactory moisture resistance and insulation.
- This type of high-voltage capacitor is crucial in application as a filter of the magnetron in a microwave oven, and, thus, since it is often used in a humid, dusty environment, it is required to achieve full voltage withstand performance in a humid environment.
- When a high-voltage capacitor is mounted in a magnetron, the grounding member is grounded, and a high-voltage of, for instance, approximately 10 kV is applied to the through conductors. Since the insulating case is present within the path extending from the through conductors to the grounding member, the insulating case is subject to the high-voltage. As a result, the insulating case, too, is required to achieve full voltage withstand performance in a humid environment. The insulating case also must achieve properties such as fire resistance, tracking resistance, toughness and water repellency.
- Materials that satisfy these performance requirements and are used to constitute the insulating case in the prior art include polybutylene terephthalate (PBT), polyethylene terephthalate and modified melamine. However, they still fail to achieve full voltage withstand performance in a humid environment.
- In addition, it is desirable that the insulating case of this type of high-voltage capacitor has a small height since the high-voltage capacitor must be mounted in a magnetron. However, if the height of the insulating case is reduced, the creeping distance extending from the through conductors to the grounding members via the surface of the insulating case also becomes reduced to result in lowered voltage withstand performance in a humid environment.
- It is an object of the present invention to provide a high-voltage capacitor achieving outstanding voltage withstand performance in a humid environment and a magnetron provided with a filter constituted of the high-voltage capacitor.
- It is a further object of the present invention to provide a high-voltage capacitor having an insulating case with a small height and achieving outstanding voltage withstand performance in a humid environment and a magnetron provided with a filter constituted of the high-voltage capacitor.
- In order to achieve the objects described above, the high-voltage capacitor according to the present invention comprises at least one grounding member, at least one capacitor, at least one through conductor, at least one insulating tube, at least one insulating case, at least one insulating cover and an insulating resin.
- The grounding member is provided with a raised portion at one surface thereof, with at least one through hole passing from the one surface to another surface and formed at the raised portion. The capacitor includes a dielectric ceramic member having at least one through hole and is constituted by providing electrodes at the two surfaces of the dielectric ceramic member at which the through hole opens with one of the electrodes connected to the grounding member to achieve electrical continuity.
- The through conductor passes through the capacitor and the grounding member and is connected to the other electrode to achieve electrical continuity. The insulating tube covers the through conductor.
- The insulating case is provided at the one surface of the grounding member. The insulating cover is provided at the other surface of the grounding member. The insulating resin fills the space inside the insulating case and the space inside the insulating cover and also fills the space around the capacitor.
- The insulating case is constituted of a material which is a mixture of polybutylene terephthalate and an inorganic material. The inorganic material, which contains glass powder and ceramic powder, is added so that its content is within a range of 15 wt % to 45 wt % relative to the entire quantity of the mixture.
- When the high-voltage capacitor structured as described above is employed in the magnetron of a microwave oven, noise traveling through the through conductor can be absorbed through the filtering effect achieved by the capacitor by using the through conductor as a power supply terminal and connecting the capacitor between the through conductor and the grounding member achieving a ground potential.
- In addition, the grounding member is provided with a through hole, and the capacitor is also provided with a through hole passing through the dielectric ceramic member, a through conductor with a higher potential relative to the potential of the ground can be installed between the grounding member achieving the ground potential and one of the electrodes at the capacitor while assuring a sufficient degree of electrical insulation achieved by the through holes.
- Since the insulating resin fills the space around the capacitor, the reliability measured in reliability tests such as high temperature load tests and moisture resistance load tests and the reliability of the capacitor when it is utilized in a hot, humid environment are improved.
- When a high-voltage capacitor is mounted in a magnetron, the grounding member is grounded, and a high-voltage is applied to the through conductor. Since the insulating case is provided within the path extending from the through conductors to the grounding member, the insulating case is subject to the high-voltage. As a result, the insulating case, too, is required to achieve full voltage withstand performance in a humid environment.
- The insulating case in the high-voltage capacitor according to the present invention is constituted of a mixture containing polybutylene terephthalate and an inorganic material. The inorganic material contains glass powder and ceramic powder and its content relative to the entire quantity of the mixture is set within the range of 15 wt % to 45 wt %. Through testing conducted by the inventor of the present invention and the like, it has been confirmed that by adopting the structure described above in the insulating case, the humid-environment voltage withstand performance of the high-voltage capacitor is greatly improved.
- The high-voltage capacitor according to the present invention having an insulating case structured as described above achieves superior voltage withstand performance in a humid environment as explained above. Thus, even if the height of the insulating case is reduced and, as a result, the creeping distance extending from the through conductor to the grounding member via the surface of the insulating case, too, becomes shorter, outstanding voltage withstand performance in a humid environment is assured.
- In a desirable application, the insulating case has a height of 12 mm or greater with one end thereof inserted in the external circumferential side of the raised portion. Through testing conducted by the inventor of the present invention and the like, it has been confirmed that the required voltage withstand performance is assured even in a humid environment by setting the height of the insulating case to at least 12 mm.
- In addition, in a desirable example of the high-voltage capacitor, the through conductor is constituted of a molding formed in the shape of a round bar with a tab portion formed by press-machining the round bar. In a through conductor adopting this structure, a connecting portion such as a caulked joint to connect the through portion, which passes through the capacitor, to the tab portion is not necessary. As a result, a high-voltage capacitor having an insulating case with a small height is realized.
- Other objects, structural features and advantages of the present invention are explained in further detail by referring to the attached drawings. The attached drawings simply present illustrations of embodiments.
- FIG. 1 is a cross-sectional view of an embodiment of the high-voltage capacitor according to the present invention;
- FIG. 2 is an exploded perspective view of the high-voltage capacitor shown in FIG. 1;
- FIG. 3 is a cross-sectional view of another embodiment of the high-voltage capacitor according to the present invention; and
- FIG. 4 is a cross-sectional view of a portion of a magnetron mounted with a filter constituted of the high-voltage capacitor according to the present invention.
- Referring to FIGS. 1 and 2, the high-voltage capacitor according to the present invention includes a
grounding member 1, acapacitor 2, throughconductors insulating tubes insulating case 6, aninsulating cover 9 andinsulating resin portions grounding member 1 is provided with a raisedportion 111 at one surface thereof, with the raisedportion 111 having a throughhole 112 passing through from the one surface to the opposite surface. - The
capacitor 2 includes a dielectricceramic member 210 having throughholes capacitor 2 is constituted by providingelectrodes 213 to 215 at the two surfaces at which the throughholes ceramic member 210 open. Theelectrode 215 of thecapacitor 2 is connected to the groundingmember 1 to achieve electrical continuity. To explain in further detail, thecapacitor 2 is located on the raisedportion 111 of the groundingmember 1, and theelectrode 215 is secured to the raisedportion 111 by a means such as soldering. The composition of the dielectricceramic member 210 constituting thecapacitor 2 is of the known art. Specific examples include the composition whose main constituent is BaTiO3—BaZrO3—CaTiO3—MgTiO3 with a single or a plurality of additives mixed in. - The through
conductors capacitor 2 and the groundingmember 1 and are respectively connected to theelectrodes conductor 4 passes through the throughhole 211 and the throughhole 112 and is connected to theelectrode 213 via anelectrode connector 12 to achieve electrical continuity. Also, the throughconductor 5 passes through the throughhole 212 and the throughhole 112 and is connected to theelectrode 214 via anelectrode connector 13 to achieve electrical continuity. The throughconductor 4 in the figures includes a throughportion 42 passing through thecapacitor 2 and atab portion 41 used as a tab connector. The throughportion 42 and thetab portion 41 are connected by a means such as a caulked joint. Likewise, the throughconductor 5 in the figures includes a throughportion 52 passing through thecapacitor 2 and atab portion 51 which is utilized as a tab connector. The throughportion 52 and thetab portion 51 are connected by a caulked joint 53. - The insulating
tubes conductors holes tubes - The insulating
case 6 is provided at one surface of the groundingmember 1. One end of the insulatingcase 6 is fitted around the external circumference of the raisedportion 111. - The insulating
cover 9 is provided at the opposite surface of the groundingmember 1. One end of the insulatingcover 9 is inserted in the internal circumference of the raisedportion 111. The insulatingcover 9 may be constituted of polybutylene terephthalate (PBT), polyethylene terephthalate or modified melamine. - The insulating
resin portions case 6 and the space inside the insulatingcover 9 and also fill the space around thecapacitor 2. To explain this in further detail, the insulatingresin 7 fills the space outside thecapacitor 2 toward the one surface of the groundingmember 1 and is in complete contact with the surface of the dielectricceramic member 210. The insulatingresin 8 fills the space inside the raisedportion 111 provided at the groundingmember 1 and fills the throughholes capacitor 2, and is in complete contact with the surface of the dielectricceramic member 210. The insulatingresin portions - In the embodiment illustrated in the figures, one
end surface 92 of the insulatingcover 9 faces opposite an inner surface (ceiling surface 113) of the raisedportion 111 at the groundingmember 1 over a gap g1, with the space inside the gap g1 filled with the insulatingresin 8. - In the high-voltage capacitor described above, the
electrode 215 of thecapacitor 2 is secured onto the one surface of the groundingmember 1 and is set on the groundingmember 1. The throughconductors capacitor 2 and the groundingmember 1 are connected to theelectrodes conductors capacitor 2 by using the throughconductors capacitor 2 between theconductors member 1 achieving the ground potential. - Since the grounding
member 1 is provided with at least one throughhole 112 and thecapacitor 2 is provided with at least one throughhole ceramic member 210, the throughconductors member 1 at the ground potential and theelectrode 215 of thecapacitor 2 while ensuring good electrical insulation with the throughholes - Since the insulating
resin portions capacitor 2, the reliability measured in reliability tests such as high-temperature load tests and moisture resistance load tests or the reliability of the capacitor when it is operated in a hot and humid environment is improved. - When the high-voltage capacitor is employed in a magnetron, the grounding
member 1 is grounded and a high-voltage is applied to the throughconductors conductors member 1, the high-voltage is also applied to the insulatingcase 6. Thus, the insulatingcase 6 needs to achieve a high level of voltage withstand performance in a humid environment. - According to the present invention, the insulating
case 6 is constituted of a mixture containing polybutylene terephthalate and an inorganic substance as a means for improving the humid environment voltage withstand performance of the insulatingcase 6. The content of the inorganic substance which includes glass powder and ceramic powder relative to the entire quantity of the mixture is set within a range of 15 wt % to 45 wt %, more desirably within a range of 20 wt % to 40 wt % and even more desirably, at approximately 30 wt %. - If the content of the inorganic substance relative to the entire quantity of the mixture is less than 15 wt %, a sufficient degree of voltage withstand performance in a humid environment cannot be achieved. If the content of the inorganic substance exceeds 45 wt %, the polybutylene terephthalate content is reduced to less than 50 wt % and a sufficient degree of mechanical strength cannot be achieved for the insulating case.
- The glass powder may be standard industrial glass powder. The ceramic powder may be SiO2 powder, Al2O3 powder or a mixture of these.
- The content of the inorganic substance constituted of the glass powder and the ceramic powder in the insulating
case 6 relative to the entire quantity of the mixture is 30 wt % in the embodiment. The contents of the glass powder and the ceramic powder relative to the entire quantity of the mixture are both 15 wt %. - Through testing conducted by the inventor of the present invention and the like, it has been confirmed that the voltage withstanding performance of the high-voltage, feed-through capacitor having the insulating
case 6 structured as described above in a humid environment is greatly improved. - The inventor of the present invention and the like conducted moisture resistance/voltage withstanding tests in order to verify the external insulation performance achieved by the high-voltage capacitor in the embodiment. TABLE I presents the results of the moisture resistance/voltage withstanding tests. The insulating case of the high-voltage capacitor, which underwent the moisture resistance/voltage withstanding tests was constituted by hot-forming a mixture containing polybutylene terephthalate and an inorganic substance. The inorganic substance contained glass powder and ceramic powder with its content relative to the entire quantity of the mixture set at 30 wt %. The contents of the glass powder and the ceramic powder relative to the entire quantity of the mixture were both set at 15 wt %.
- For purposes of comparison, moisture resistance/voltage withstanding tests were also conducted on a high-voltage capacitor in the prior art. The high-voltage capacitor of the prior art that underwent the tests was structured identically to the high-voltage capacitor in the embodiment except that its insulating case was constituted of high-quality polybutylene terephthalate resin G2930 manufactured by Mitsubishi Rayon Inc.
- For each moisture resistance/voltage withstanding test, the high-voltage capacitor was placed inside an acrylic box and the atmosphere inside the acrylic box was constantly humidified by using a humidifier. A voltage was applied to the high-voltage capacitor from a microwave oven power supply. In more specific terms, a DC voltage of 10 kV was applied to the high-voltage capacitor through application cycles each comprising 10 seconds of an on-period and five seconds of an off-period with the application cycles sustained until the high-voltage capacitor became burned and electrically continuous. The varying number of application cycles (hereafter referred to as the number of continuity-inducing application cycles) leading to the occurrence of electrical continuity due to burning are presented in TABLE I. It is to be noted that each number of continuity-inducing application cycles represents the number of application cycles recorded for a sample which became burned and electrically continuous at the smallest number of application cycles among 10 samples tested at each of the various heights set for the insulating case. A larger number of continuity-inducing application cycles indicates superior voltage withstand performance in a humid environment.
TABLE I Height of insulating case measured from end surface of grounding member 20 mm 18 mm 16 mm 14 mm 12 mm 10 mm High-voltage 182 128 52 — — — capacitor in cycles cycles cycles in prior art High-voltage 500 500 500 420 185 86 capacitor according cycles cycles cycles cycles cycles cycles to present invention or more or more or more - In TABLE I, the number of continuity-inducing application cycles recorded for the high-voltage capacitor in the embodiment at a given height should be compared against the number of continuity-inducing application cycles recorded for the high-voltage capacitor in the prior art at the same height. The results presented in TABLE I indicate that compared to the high-voltage capacitor in the prior art, the humid environment voltage withstand performance of the high-voltage capacitor is greatly improved.
- The high-voltage capacitor according to the present invention having the insulating
case 6 structured as explained above achieves a high level of voltage withstand performance in a humid environment. Thus, even if the height h0 of the insulatingcase 6 is reduced and, as a result, the length of the path “a” (creeping distance) extending from the throughconductors member 1 via the surface of the insulatingcase 6 is also reduced, outstanding voltage withstand performance in a humid environment is assured. TABLE I indicates that even when the height h0 of the insulatingcase 6 in the high-voltage capacitor according to the present invention is set at 12 mm, a voltage withstand performance in a humid environment corresponding to 185 continuity-inducing application cycles is assured. - Under normal circumstances, the height of the insulating case in a high-voltage capacitor is set equal to or smaller than 20 mm, to ensure that the high-voltage capacitor can be fitted in a magnetron with ease. As indicated in TABLE I, the number of continuity-inducing application cycles in the high-voltage capacitor in the prior art having an insulating case with a height of 20 mm is 182.
- The insulating
case 6 of a high-voltage capacitor should preferably have a height h0 as small as 12 mm. As indicated in TABLE I, when the height h0 of the insulating case in the high-voltage capacitor according to the present invention is set to 12 mm or greater, voltage withstand performance in a humid environment that is comparable to, or superior to that of the high-voltage capacitor in the prior art (with the height h0 of the insulating case at h0=20 mm), is achieved. - FIG. 3 is a cross-sectional view of another embodiment of the high-voltage capacitor according to the present invention. In the figure, the same reference numbers as those in FIGS. 1 and 2 are assigned to components identical to the corresponding components in the high-voltage capacitor in FIG. 1. The high-voltage capacitor in FIG. 3 is characterized in that the through
conductor 4 is constituted of a molding formed in the shape of a round bar having atab portion 41 formed by press-machining the round bar. The throughconductor 5, too, is constituted of a molding formed in the shape of a round a bar having atab portion 51 formed by press-machining the round bar, as is the throughconductor 4. The throughconductors tab portions tab portions - In the high-voltage capacitor shown in FIG. 3, the through
conductors tab portions conductors portions capacitor 2 to thetab portions case 6 with a small height h0 is realized. - FIG. 4 is a cross-sectional view of a portion of a magnetron mounted with a filter constituted of the high-voltage capacitor according to the present invention. In the figure,
reference number 15 indicates a cathode stem,reference number 16 indicates a filter box, reference numbers 17 and 18 each indicate an inductor andreference number 19 indicates the high-voltage capacitor according to the present invention utilized in conjunction with the inductors 17 and 18 to constitute a filter. Thefilter box 16 encloses thecathode stem 15, and the high-voltage capacitor 19 is provided so as to allow the insulatingresin 7 to be exposed outside through a through hole formed at aside plate 161 of thefilter box 16 with its groundingmember 1 securely attached to theside plate 161 of thefilter box 16. The inductors 17 and 18 are connected in series between the cathode terminal of thecathode stem 15 and the throughconductors voltage capacitor 19 inside thefilter box 16.Reference number 21 indicates cooling fins,reference number 22 indicates a gasket,reference number 23 indicates an RF output end andreference number 24 indicates a magnet. - In order to oscillate the magnetron in a microwave oven, of voltage of approximately 4 kVO-P having a commercial frequency or a frequency within a range of 20 KHz to 40 KHz is supplied to the through
conductors voltage capacitor 19. The high-voltage thus supplied is then supplied to the magnetron from the throughconductors conductors capacitor 2 and the inductors 17 and 18. - In addition, since the insulating
resin portions capacitor 2, a sufficient degree of reliability is assured even when the high-voltage capacitor is utilized in a microwave oven which constitutes a hot and moist environment. - Furthermore, the high-
voltage capacitor 19 provided with the insulatingcase 6 structured as described above achieves outstanding voltage withstand performance in a humid environment. As a result, by adopting the high-voltage capacitor 19 according to the present invention in the magnetron of a microwave oven which constitutes a hot and humid environment, the reliability of the magnetron is improved.
Claims (4)
1. A high-voltage capacitor comprising;
at least one grounding member having a raised portion provided with at least one through hole;
at least one capacitor including a dielectric ceramic member having at least one through hole and is provided with electrodes at surfaces where said through hole of said dielectric ceramic member opens, one of said electrodes being connected to said grounding member so as to achieve electrical continuity;
at least one through conductor passing through said grounding member and said capacitor and connected to another of said electrodes so as to achieve electrical continuity;
at least one insulating tube covering said through conductor;
at least one insulating case provided at one surface of said grounding member;
at least one insulating cover provided at another surface of said grounding member opposite said one surface; and
insulating resins filling a space inside said insulating case, a space inside said insulating cover and a space around said capacitor, wherein:
said insulating case is constituted of a mixture containing polybutylene terephthalate and an inorganic substance containing glass powder and ceramic powder, the content of said inorganic substance is set within a range of 15 wt % to 45 wt % relative to the quantity of said mixture.
2. The high-voltage capacitor of , wherein;
claim 1
said insulating case has one end fixed around an external circumference of said raised portion and has a height of 12 mm or greater.
3. The high-voltage capacitor of , wherein;
claim 1
said through conductor is constituted of a molding formed in the shape of a round bar having a tab portion formed by press-machining said round bar.
4. A magnetron having a filter constituted of the high-voltage capacitor of .
claim 1
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2000101594 | 2000-04-03 | ||
JP2000-101594 | 2000-04-03 | ||
JP2001-061417 | 2001-03-06 | ||
JP2001061417A JP3803258B2 (en) | 2000-04-03 | 2001-03-06 | High-voltage feedthrough capacitor and magnetron |
Publications (2)
Publication Number | Publication Date |
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US20010036053A1 true US20010036053A1 (en) | 2001-11-01 |
US6344962B2 US6344962B2 (en) | 2002-02-05 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/822,340 Expired - Lifetime US6344962B2 (en) | 2000-04-03 | 2001-04-02 | High voltage capacitor and magnetron |
Country Status (6)
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US (1) | US6344962B2 (en) |
JP (1) | JP3803258B2 (en) |
KR (1) | KR100626682B1 (en) |
CN (1) | CN1231931C (en) |
MY (1) | MY117622A (en) |
TW (1) | TW507227B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9396877B2 (en) | 2012-12-21 | 2016-07-19 | Tdk Corporation | High voltage capacitor |
US11862405B2 (en) | 2022-02-17 | 2024-01-02 | Tdk Corporation | High-voltage feed-through capacitor |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100442934B1 (en) * | 2001-10-25 | 2004-08-02 | 주식회사 대우일렉트로닉스 | A capacitor for micro-wave oven |
US9646339B2 (en) * | 2002-09-16 | 2017-05-09 | Touchtunes Music Corporation | Digital downloading jukebox system with central and local music servers |
JP2005109006A (en) * | 2003-09-29 | 2005-04-21 | Tdk Corp | High-voltage feed-through capacitor and magnetron |
KR100591309B1 (en) * | 2003-12-30 | 2006-06-19 | 엘지전자 주식회사 | High voltage condenser for magnetron |
JP2005217296A (en) * | 2004-01-30 | 2005-08-11 | Tdk Corp | High-voltage feeding capacitor, high-voltage feed-through capacitor device, and magnetron |
JP2006086405A (en) * | 2004-09-17 | 2006-03-30 | Matsushita Electric Ind Co Ltd | Feed-through capacitor and magnetron |
JP4157092B2 (en) * | 2004-11-29 | 2008-09-24 | Tdk株式会社 | motor |
JP4433198B2 (en) * | 2005-08-29 | 2010-03-17 | Tdk株式会社 | High-voltage feedthrough capacitor and magnetron |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2602610B1 (en) | 1986-08-08 | 1994-05-20 | Merlin Et Gerin | STATIC TRIGGER OF AN ELECTRIC CIRCUIT BREAKER WITH CONTACT WEAR INDICATOR |
KR880003356A (en) * | 1986-08-13 | 1988-05-16 | 무라다 아끼라 | High pressure capacitor |
DE3781752T2 (en) * | 1986-09-11 | 1993-01-07 | Tdk Corp | PERFORMANCE TYPE CAPACITOR AND ITS USE IN A MAGNETRON. |
JPH01116423A (en) | 1987-10-30 | 1989-05-09 | Koyo Seiko Co Ltd | Torque detector |
JPH01135725A (en) | 1987-10-30 | 1989-05-29 | Svs Lab Inc | Production of anti-ph unstable alpha interferon antibody |
US5032949A (en) * | 1988-06-07 | 1991-07-16 | Tdk Corporation | High-voltage through-type ceramic capacitor |
US5142436A (en) * | 1990-02-27 | 1992-08-25 | Samsung Electro-Mechanics Co., Ltd. | Piercing through type capacitor |
EP0604652B1 (en) * | 1991-08-27 | 1998-07-01 | TDK Corporation | High-voltage capacitor and magnetron |
JP3473795B2 (en) * | 1995-05-22 | 2003-12-08 | Tdk株式会社 | High voltage capacitors and magnetrons |
JP3248619B2 (en) * | 1999-03-05 | 2002-01-21 | ティーディーケイ株式会社 | High voltage feedthrough capacitors and magnetrons |
-
2001
- 2001-03-06 JP JP2001061417A patent/JP3803258B2/en not_active Expired - Fee Related
- 2001-03-16 MY MYPI20011248A patent/MY117622A/en unknown
- 2001-03-29 KR KR1020010016367A patent/KR100626682B1/en active IP Right Grant
- 2001-04-02 US US09/822,340 patent/US6344962B2/en not_active Expired - Lifetime
- 2001-04-02 TW TW090107872A patent/TW507227B/en not_active IP Right Cessation
- 2001-04-03 CN CNB011102616A patent/CN1231931C/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9396877B2 (en) | 2012-12-21 | 2016-07-19 | Tdk Corporation | High voltage capacitor |
US11862405B2 (en) | 2022-02-17 | 2024-01-02 | Tdk Corporation | High-voltage feed-through capacitor |
Also Published As
Publication number | Publication date |
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KR100626682B1 (en) | 2006-09-22 |
CN1316753A (en) | 2001-10-10 |
MY117622A (en) | 2004-07-31 |
TW507227B (en) | 2002-10-21 |
US6344962B2 (en) | 2002-02-05 |
JP2001351830A (en) | 2001-12-21 |
CN1231931C (en) | 2005-12-14 |
JP3803258B2 (en) | 2006-08-02 |
KR20010095060A (en) | 2001-11-03 |
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