JP4973543B2 - Metallized film capacitors - Google Patents

Metallized film capacitors Download PDF

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JP4973543B2
JP4973543B2 JP2008047045A JP2008047045A JP4973543B2 JP 4973543 B2 JP4973543 B2 JP 4973543B2 JP 2008047045 A JP2008047045 A JP 2008047045A JP 2008047045 A JP2008047045 A JP 2008047045A JP 4973543 B2 JP4973543 B2 JP 4973543B2
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film
metal
metallized film
electrode
deposition electrode
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JP2009206296A (en
JP2009206296A5 (en
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幸和 大地
宏樹 竹岡
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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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
    • H01G4/002—Details
    • H01G4/018—Dielectrics
    • H01G4/06—Solid dielectrics
    • H01G4/14—Organic dielectrics
    • H01G4/18—Organic dielectrics of synthetic material, e.g. derivatives of cellulose
    • 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
    • H01G4/002—Details
    • H01G4/018—Dielectrics
    • H01G4/06—Solid dielectrics
    • H01G4/14—Organic dielectrics
    • H01G4/145—Organic dielectrics vapour deposited
    • 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
    • H01G4/32—Wound capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Description

本発明は各種電子機器、電気機器、産業機器、自動車等に使用され、特に、ハイブリッド自動車のモータ駆動用インバータ回路の平滑用、フィルタ用、スナバ用に最適な金属化フィルムコンデンサに関するものである。   The present invention relates to a metallized film capacitor that is used in various electronic devices, electrical devices, industrial devices, automobiles, and the like, and is particularly suitable for smoothing, filtering, and snubbing of a motor drive inverter circuit of a hybrid vehicle.

近年、環境保護の観点から、あらゆる電気機器がインバータ回路で制御され、省エネルギー化、高効率化が進められている。中でも自動車業界においては、電気モータとエンジンで走行するハイブリッド車（以下、ＨＥＶと呼ぶ）が市場導入される等、地球環境に優しく、省エネルギー化、高効率化に関する技術の開発が活発化している。   In recent years, from the viewpoint of environmental protection, all electric devices are controlled by inverter circuits, and energy saving and high efficiency are being promoted. In particular, in the automobile industry, hybrid vehicles (hereinafter referred to as HEVs) that run on electric motors and engines have been introduced into the market, and the development of technologies relating to energy saving and high efficiency has been activated, which is friendly to the global environment.

このようなＨＥＶ用の電気モータは使用電圧領域が数百ボルトと高いため、このような電気モータに関連して使用されるコンデンサとして、高耐電圧で低損失の電気特性を有する金属化フィルムコンデンサが注目されており、更に市場におけるメンテナンスフリー化の要望からも極めて寿命が長い金属化フィルムコンデンサを採用する傾向が目立っている。   Since such a HEV electric motor has a high operating voltage range of several hundred volts, a metallized film capacitor having high withstand voltage and low loss electric characteristics as a capacitor used in connection with such an electric motor. In addition, the trend of adopting metalized film capacitors with a very long life is conspicuous due to the demand for maintenance-free in the market.

そして、このような金属化フィルムコンデンサは、一般に金属箔を電極に用いるものと、誘電体フィルム上に設けた蒸着金属を電極に用いるものとに大別される。中でも、蒸着金属を電極（以下、金属蒸着電極と呼ぶ）とする金属化フィルムコンデンサは、金属箔のものに比べて電極の占める体積が小さく小型軽量化が図れることと、金属蒸着電極特有の自己回復機能（絶縁欠陥部で短絡が生じた場合に、短絡のエネルギーで欠陥部周辺の金属蒸着電極が蒸発・飛散して絶縁化し、コンデンサの機能が回復する性能）により絶縁破壊に対する信頼性が高いことから、従来から広く用いられているものである。   Such metallized film capacitors are roughly classified into those generally using a metal foil as an electrode and those using a deposited metal provided on a dielectric film as an electrode. Among these, metallized film capacitors that use vapor-deposited metal as an electrode (hereinafter referred to as metal vapor-deposited electrode) have a smaller volume occupied by the electrode compared to that of metal foil and can be reduced in size and weight. High reliability in dielectric breakdown due to recovery function (capacity of metal evaporated electrode around the defective part evaporates and scatters and insulates when the short-circuit occurs in the defective part) Therefore, it has been widely used conventionally.

図４はこの種の従来の金属化フィルムコンデンサの構成を示した断面図、図５は同金属化フィルムコンデンサに使用される第１蒸着電極の平面図、図６は同第２蒸着電極の平面図であり、図４〜図６において、１１はポリプロピレンフィルム等の誘電体フィルム１３の片面上にアルミニウムを蒸着した第１蒸着電極であり、この第１蒸着電極１１は、容量形成部１１ａと、メタリコン部１５とのコンタクト部１１ｂから構成され、かつ、図５に示すように、分割スリット１６により四角形の格子状に分割された分割電極１９と、各分割電極１９を並列接続するヒューズ１７とを有するものである。   4 is a cross-sectional view showing the structure of a conventional metallized film capacitor of this type, FIG. 5 is a plan view of a first vapor deposition electrode used in the metallized film capacitor, and FIG. 6 is a plane of the second vapor deposition electrode. 4 to 6, reference numeral 11 denotes a first vapor-deposited electrode in which aluminum is vapor-deposited on one surface of a dielectric film 13 such as a polypropylene film. The first vapor-deposited electrode 11 includes a capacitance forming portion 11a, As shown in FIG. 5, a divided electrode 19 that is formed of a contact portion 11 b with the metallicon portion 15 and is divided into a square lattice by the dividing slits 16, and a fuse 17 that connects the divided electrodes 19 in parallel. It is what you have.

また、１２はポリプロピレンフィルム等の誘電体フィルム１８の片面全体にアルミニウムを蒸着した第２蒸着電極であり、この第２蒸着電極１２は、容量形成部１２ａと、メタリコン部１５とのコンタクト部１２ｂから構成され、分割スリットは有しておらず、かつ、第２蒸着電極１２の容量形成部１２ａの膜抵抗値は、図４に示すように膜厚を第１蒸着電極１１より薄くして容量形成部１１ａの膜抵抗値よりも高く設定しているものである。なお、１４は絶縁マージンである。   Reference numeral 12 denotes a second vapor-deposited electrode in which aluminum is vapor-deposited on the entire surface of the dielectric film 18 such as a polypropylene film. The second vapor-deposited electrode 12 is formed from the contact portion 12b between the capacitance forming portion 12a and the metallicon portion 15. It is configured, has no split slit, and the film resistance value of the capacitance forming portion 12a of the second vapor deposition electrode 12 is formed by making the film thickness thinner than that of the first vapor deposition electrode 11 as shown in FIG. This is set higher than the film resistance value of the portion 11a. Reference numeral 14 denotes an insulation margin.

このように構成された従来の金属化フィルムコンデンサは、第２蒸着電極１２の容量形成部１２ａの膜抵抗値を、第１蒸着電極１１の容量形成部１１ａの膜抵抗値よりも高くすることにより、容量減少の小さい金属化フィルムコンデンサを実現することができるというものであった（特許文献１）。   The conventional metallized film capacitor configured as described above is configured such that the film resistance value of the capacitance forming portion 12a of the second vapor deposition electrode 12 is higher than the film resistance value of the capacitance forming portion 11a of the first vapor deposition electrode 11. In other words, a metallized film capacitor with a small capacity reduction can be realized (Patent Document 1).

また、図７は上記図４に示した金属化フィルムコンデンサの蒸着電極の酸化や腐食を防止する目的で、表面にオイル保護膜を形成する製造装置のオイル保護膜形成部近傍を拡大した断面図であり、図７において、２３ａはフィルム２３が走行する方向、２４は蒸着膜、２５はオイルタンク、２６はオイル、２７は加熱ヒータ、２８はオイル蒸気、２９は温度センサ、３０は圧力センサ、３１はノズル、３２はオイル保護膜を示し、このようにオイル保護膜形成部は、円筒状のオイルタンク２５の内部にオイル２６、加熱ヒータ２７、温度センサ２９および圧力センサ３０が収納されているものである。   7 is an enlarged cross-sectional view of the vicinity of an oil protective film forming portion of a manufacturing apparatus for forming an oil protective film on the surface for the purpose of preventing oxidation and corrosion of the vapor deposition electrode of the metalized film capacitor shown in FIG. 7, 23a is a direction in which the film 23 travels, 24 is a vapor deposition film, 25 is an oil tank, 26 is oil, 27 is a heater, 28 is oil vapor, 29 is a temperature sensor, 30 is a pressure sensor, Reference numeral 31 denotes a nozzle, and 32 denotes an oil protective film. In this way, the oil protective film forming unit houses the oil 26, the heater 27, the temperature sensor 29, and the pressure sensor 30 inside the cylindrical oil tank 25. Is.

このように構成されたオイル保護膜形成部は、加熱ヒータ２７により加熱されたオイル２６はオイル蒸気２８となりノズル３１から噴出し、矢印２３ａの方向へ走行するフィルム２３に設けられた蒸着膜２４のノズル側にオイル保護膜３２を形成する。なお、温度センサ２９と圧力センサ３０は、オイルタンク２５内部の温度と圧力をモニタリングするものであり、特に圧力センサ３０により、長尺のフィルムを金属化する場合であっても、蒸着中のオイル噴出量を一定に保ち、均一なオイル保護膜を形成することができるというものであった(特許文献２)。
特開２００４−９５６０４号公報 特許第３７６７５０５号公報 In the oil protective film forming section configured as described above, the oil 26 heated by the heater 27 becomes oil vapor 28 and is ejected from the nozzle 31, and the deposited film 24 provided on the film 23 traveling in the direction of the arrow 23 a is formed. An oil protective film 32 is formed on the nozzle side. The temperature sensor 29 and the pressure sensor 30 are for monitoring the temperature and pressure inside the oil tank 25. In particular, even when a long film is metalized by the pressure sensor 30, the oil during vapor deposition is used. The spray amount was kept constant, and a uniform oil protective film could be formed (Patent Document 2).
JP 2004-95604 A Japanese Patent No. 3767505

しかしながら上記従来の金属化フィルムコンデンサでは、金属化フィルムに設けられたオイル保護膜３２が、絶縁マージンを含む金属化フィルムの全面に形成されているために、メタリコンとの密着性が悪く、かつ、漏れ電流が多いという課題があった。   However, in the conventional metallized film capacitor, since the oil protective film 32 provided on the metallized film is formed on the entire surface of the metallized film including the insulation margin, the adhesion with the metallicon is poor, and There was a problem that there was a lot of leakage current.

本発明はこのような従来の課題を解決し、メタリコンとの密着性に優れ、かつ、漏れ電流が少ない、優れた性能の金属化フィルムコンデンサを提供することを目的とするものである。   An object of the present invention is to solve such a conventional problem, and to provide a metallized film capacitor having excellent performance with excellent adhesion to a metallicon and low leakage current.

上記課題を解決するために本発明は、誘電体フィルム上に金属蒸着電極を形成した金属化フィルムを一対とし、金属蒸着電極が誘電体フィルムを介して対向するように重ね合わせて巻回した素子と、この素子の両端面に金属溶射によって形成された一対のメタリコン電極からなる金属化フィルムコンデンサにおいて、金属化フィルムとして、誘電体フィルムの幅方向の一端側に非金属蒸着部からなる絶縁マージンを長手方向に連続して設け、この絶縁マージンを除く部分に金属蒸着電極を形成すると共に、金属化フィルムの一端側に設けた絶縁マージンと異なる側の端部に、金属蒸着電極を厚く形成して抵抗値を低くした低抵抗部を設け、絶縁マージンを除いて形成された金属蒸着電極上にオイル保護膜を形成し、低抵抗部上に形成するオイル保護膜の厚みを、低抵抗部を除く金属蒸着電極上に形成されたオイル保護膜の厚さの９０％以下とした構成のものである。 The present invention in order to solve the above problems, the dielectric film metallized film forming a metal deposition electrode is a pair on, metals deposition electrode is superposed so as to face via the dielectric film winding And a metallized film capacitor comprising a pair of metallicon electrodes formed by metal spraying on both end faces of the element, as a metallized film, an insulation comprising a non-metal vapor deposition portion on one end side in the width direction of the dielectric film. A margin is continuously provided in the longitudinal direction, and a metal vapor deposition electrode is formed on a portion excluding the insulation margin, and a metal vapor deposition electrode is formed thickly on an end portion different from the insulation margin provided on one end side of the metallized film. to the low resistance section is provided the resistance value was lowered, Oy which forms an oil protective film on the metal deposition electrode formed except insulation margin, it is formed on the low-resistance portion The thickness of the protective film is of a configuration in which more than 90% of the thickness of the oil protective film formed on the metal deposition electrodes except for the low-resistance portion.

以上のように本発明による金属化フィルムコンデンサは、金属化フィルム上に形成したオイル保護膜が絶縁マージン上に形成されていないことにより、金属蒸着電極からメタリコン電極へと流れる電流を低減し、漏れ電流を少なくすることができるという効果が得られるものである。   As described above, the metallized film capacitor according to the present invention reduces the current flowing from the metal vapor deposition electrode to the metallicon electrode because the oil protective film formed on the metallized film is not formed on the insulation margin. The effect that current can be reduced is obtained.

（実施の形態１）
以下、実施の形態１を用いて、本発明の特に請求項１に記載の発明について説明する。 (Embodiment 1)
Hereinafter, the first aspect of the present invention will be described with reference to the first embodiment.

図１は本発明の実施の形態１による金属化フィルムコンデンサの構成を示した断面図であり、図１において、１はポリプロピレンフィルム等からなる誘電体フィルム、２はこの誘電体フィルム１の片面上に一端の絶縁マージン３を除いてアルミニウムの金属を蒸着することにより形成された金属蒸着電極であり、これにより金属化フィルムが形成されているものである。   FIG. 1 is a cross-sectional view showing the configuration of a metallized film capacitor according to Embodiment 1 of the present invention. In FIG. 1, 1 is a dielectric film made of polypropylene film or the like, and 2 is one side of the dielectric film 1. The metal-deposited electrode is formed by vapor-depositing aluminum metal except for the insulation margin 3 at one end, and a metallized film is formed thereby.

４はこの金属化フィルムに形成された金属蒸着電極２の表面に設けられたオイル保護膜であり、このオイル保護膜４はシリコン系オイル、フッ素系オイル、炭化水素系オイル等を気化させて蒸着することによって形成したものであり、上記金属蒸着電極２を形成するアルミニウムの酸化や腐食を防止して耐湿性を向上させることを目的としており、特に、自動車用に使用されるコンデンサ等のような高抵抗のものは金属蒸着電極２の厚みが薄いために有効なものである。   4 is an oil protective film provided on the surface of the metal vapor deposition electrode 2 formed on the metallized film. The oil protective film 4 is vapor deposited by vaporizing silicon oil, fluorine oil, hydrocarbon oil, or the like. The purpose of this is to improve the moisture resistance by preventing oxidation and corrosion of the aluminum forming the metal vapor deposition electrode 2, and in particular, for capacitors used for automobiles, etc. A high resistance material is effective because the thickness of the metal vapor deposition electrode 2 is thin.

また、上記オイル保護膜４は、絶縁マージン３を除く金属蒸着電極２の表面のみに形成されているものであり、マスク方式等の公知の方法を用いて、上記絶縁マージン３にオイル保護膜４が付着しないようにしているものである。   The oil protective film 4 is formed only on the surface of the metal vapor deposition electrode 2 excluding the insulating margin 3, and the oil protective film 4 is formed on the insulating margin 3 using a known method such as a mask method. Is to prevent adhesion.

そして、このように形成された金属化フィルムを一対とし、上記金属蒸着電極２が誘電体フィルム１を介して対向するように重ね合わせて巻回し、両端面に亜鉛を溶射したメタリコン電極５を形成することによって本実施の形態による金属化フィルムコンデンサが構成されているものである。   Then, the metallized film 5 thus formed is paired, and the metal vapor-deposited electrode 2 is overlapped and wound so as to face each other with the dielectric film 1 therebetween, and the metallicon electrode 5 is formed by spraying zinc on both end faces. Thus, the metallized film capacitor according to the present embodiment is constituted.

このように構成された本実施の形態による金属化フィルムコンデンサは、オイル保護膜４を絶縁マージン３上に設けない構成により、金属蒸着電極２からメタリコン電極５へと流れる電流を低減し、漏れ電流を少なくすることができるという格別の効果を奏するものである。すなわち、絶縁マージン３上に誘電体フィルム１よりも抵抗値が低い材料（オイル保護膜等）が存在する場合には、金属蒸着電極２からメタリコン電極５へと流れる電流が増加するために漏れ電流が多くなるものである。   The metallized film capacitor according to the present embodiment configured as described above has a configuration in which the oil protective film 4 is not provided on the insulation margin 3, thereby reducing the current flowing from the metal vapor deposition electrode 2 to the metallicon electrode 5, and leakage current. There is a special effect that can be reduced. That is, when a material (oil protective film or the like) having a resistance value lower than that of the dielectric film 1 is present on the insulating margin 3, the current flowing from the metal vapor deposition electrode 2 to the metallicon electrode 5 is increased, so that leakage current is increased. There are many things.

このように構成された本実施の形態による金属化フィルムコンデンサの漏れ電流特性ならびにメタリコン電極との密着性を評価した結果を比較例としての従来品（オイル保護膜が絶縁マージンを含む全面に形成されたもの）と比較して（表１）に示す。   The conventional product (oil protective film is formed on the entire surface including the insulation margin) as a comparative example based on the evaluation results of the leakage current characteristics of the metallized film capacitor and the adhesion to the metallicon electrode according to the present embodiment configured as described above. (Table 1).

Figure 0004973543
Figure 0004973543

（表１）から明らかなように、本実施の形態による金属化フィルムコンデンサは、従来品と比較して漏れ電流特性に優れることが分かるものである。   As is clear from Table 1, it can be seen that the metallized film capacitor according to the present embodiment is superior in leakage current characteristics as compared with the conventional product.

（実施の形態２）
以下、実施の形態２を用いて、本発明の特に請求項２に記載の発明について説明する。 (Embodiment 2)
The second aspect of the present invention will be described below with reference to the second embodiment.

本実施の形態は、上記実施の形態１で図１を用いて説明した金属化フィルムコンデンサに使用される金属化フィルムの構成が一部異なるようにしたものであり、これ以外の構成は実施の形態１と同様であるために同一部分には同一の符号を付与してその詳細な説明は省略し、異なる部分についてのみ以下に図面を用いて詳細に説明する。   In the present embodiment, the structure of the metallized film used in the metallized film capacitor described in the first embodiment with reference to FIG. 1 is partially different. Since it is the same as that of the first embodiment, the same reference numerals are given to the same parts and the detailed description thereof is omitted, and only different parts will be described in detail below with reference to the drawings.

図２は本発明の実施の形態２による金属化フィルムコンデンサの構成を示した断面図、図３は同金属化フィルムコンデンサに使用される金属化フィルムの要部を拡大した断面図であり、図２と図３において、６は金属化フィルムの一端側に設けた絶縁マージン３と異なる側の端部に設けた低抵抗部であり、この低抵抗部６は金属蒸着電極２を厚く形成することによって抵抗値を低くしたものであり、この低抵抗部６は金属蒸着電極２と同様にアルミニウムを用いて形成しても良いし、亜鉛を用いて形成しても良いものである。   FIG. 2 is a cross-sectional view showing a configuration of a metallized film capacitor according to Embodiment 2 of the present invention, and FIG. 3 is an enlarged cross-sectional view of a main part of the metallized film used in the metallized film capacitor. 2 and 3, reference numeral 6 denotes a low resistance portion provided at an end portion on a different side from the insulating margin 3 provided on one end side of the metallized film, and the low resistance portion 6 forms the metal deposition electrode 2 thickly. The low resistance portion 6 may be formed using aluminum as in the case of the metal deposition electrode 2 or may be formed using zinc.

また、４はオイル保護膜であり、このオイル保護膜４は上記実施の形態１と同様に、絶縁マージン３を除く金属蒸着電極２ならびに低抵抗部６の表面のみに形成されているものであり、かつ、上記低抵抗部６上に形成するオイル保護膜４の厚みｔ２を、金属蒸着電極２上に形成するオイル保護膜４の厚みｔ１の９０％以下（ｔ２／ｔ１＝０．９以下）の厚みになるように形成したものである。   Reference numeral 4 denotes an oil protective film, and the oil protective film 4 is formed only on the surfaces of the metal vapor deposition electrode 2 and the low resistance portion 6 except for the insulation margin 3 as in the first embodiment. In addition, the thickness t2 of the oil protective film 4 formed on the low resistance portion 6 is 90% or less of the thickness t1 of the oil protective film 4 formed on the metal vapor deposition electrode 2 (t2 / t1 = 0.9 or less). It is formed so that it may become thickness.

このように構成された本実施の形態による金属化フィルムコンデンサは、低抵抗部６を設けると共に、この低抵抗部６上に形成するオイル保護膜４の厚みを金属蒸着電極２上に形成するオイル保護膜４の厚みの９０％以下とした構成により、上記実施の形態1による金属化フィルムコンデンサにより得られる効果に加え、メタリコン電極５を形成する際に密着性を悪化させる要因となるオイル保護膜４が薄いために密着性を向上させることができるという格別の効果を奏するものである。   The metallized film capacitor according to the present embodiment configured as described above is provided with the low resistance portion 6 and the oil for forming the thickness of the oil protective film 4 formed on the low resistance portion 6 on the metal vapor deposition electrode 2. In addition to the effect obtained by the metallized film capacitor according to the first embodiment, the oil protective film which causes deterioration of adhesion when forming the metallicon electrode 5 due to the structure of 90% or less of the thickness of the protective film 4 Since 4 is thin, there is an extraordinary effect that adhesion can be improved.

このように構成された本実施の形態による金属化フィルムコンデンサの、低抵抗部６上に形成するオイル保護膜４の厚みｔ２と金属蒸着電極２上に形成するオイル保護膜４の厚みｔ１の関係（ｔ２／ｔ１）による漏れ電流特性ならびにメタリコン電極との密着性を評価した結果を比較例としての従来品（オイル保護膜が絶縁マージンを含む全面に形成されたもの）と比較して前述の（表１）に示す。   The relationship between the thickness t2 of the oil protective film 4 formed on the low resistance portion 6 and the thickness t1 of the oil protective film 4 formed on the metal deposition electrode 2 of the metallized film capacitor according to the present embodiment configured as described above. The result of evaluating the leakage current characteristics by (t2 / t1) and the adhesion to the metallicon electrode was compared with the conventional product (where the oil protective film was formed on the entire surface including the insulation margin) as a comparative example as described above ( Table 1) shows.

（表１）から明らかなように、本実施の形態による金属化フィルムコンデンサは、従来品と比較して漏れ電流特性ならびにメタリコン電極との密着性に優れることが分かるものである。また、低抵抗部６上に形成するオイル保護膜４の厚みｔ２と金属蒸着電極２上に形成するオイル保護膜４の厚みｔ１の関係（ｔ２／ｔ１）については９０％以下の範囲内が好ましく、これより大きいとメタリコン電極との密着性が少し悪くなり（実施の形態１と同程度）、また逆に小さくなるとオイル保護膜としての機能が低下して耐湿性が悪化するために好ましくないことから、９０〜５０％の範囲が適していると言えるものである。   As is clear from Table 1, it can be seen that the metallized film capacitor according to the present embodiment is superior in leakage current characteristics and adhesion to the metallicon electrode as compared with the conventional product. Further, the relationship (t2 / t1) between the thickness t2 of the oil protective film 4 formed on the low resistance portion 6 and the thickness t1 of the oil protective film 4 formed on the metal deposition electrode 2 is preferably within 90% or less. If it is larger than this, the adhesion with the metallicon electrode is slightly worse (same as in the first embodiment). On the other hand, if it is smaller, the function as an oil protective film is lowered and the moisture resistance is deteriorated. Therefore, it can be said that the range of 90 to 50% is suitable.

なお、本実施の形態においては、上記低抵抗部６上に形成したオイル保護膜４の厚みは均一な厚みで形成した例を用いて説明したが、本発明はこれに限定されるものではなく、少なくともメタリコン電極５と接続される部分のオイル保護膜４の厚みｔ２が金属蒸着電極２上に形成されるオイル保護膜４の厚みｔ１の９０％以下の範囲内であれば良いものであり、このメタリコン電極５と接続される部分以外のオイル保護膜４の厚みｔ２を金属蒸着電極２上に形成されるオイル保護膜４の厚みｔ１と同等とすることにより、耐湿性の向上を図ることができるようになるものである。   In the present embodiment, the oil protective film 4 formed on the low resistance portion 6 has been described as having a uniform thickness. However, the present invention is not limited to this. The thickness t2 of the oil protective film 4 at least connected to the metallicon electrode 5 may be within a range of 90% or less of the thickness t1 of the oil protective film 4 formed on the metal vapor-deposited electrode 2. By making the thickness t2 of the oil protective film 4 other than the portion connected to the metallicon electrode 5 equal to the thickness t1 of the oil protective film 4 formed on the metal vapor-deposited electrode 2, the moisture resistance can be improved. It will be possible.

本発明による金属化フィルムコンデンサは、漏れ電流が少なく、かつ、メタリコン電極との密着性に優れるという効果を有し、特に高い信頼性が要求される自動車用のコンデンサ等として有用である。   The metallized film capacitor according to the present invention has an effect that the leakage current is small and the adhesiveness with the metallicon electrode is excellent, and it is useful as a capacitor for automobiles particularly requiring high reliability.

本発明の実施の形態１による金属化フィルムコンデンサの構成を示した断面図Sectional drawing which showed the structure of the metallized film capacitor by Embodiment 1 of this invention 本発明の実施の形態２による金属化フィルムコンデンサの構成を示した断面図Sectional drawing which showed the structure of the metallized film capacitor by Embodiment 2 of this invention 同金属化フィルムコンデンサに使用される金属化フィルムの要部を拡大した断面図Sectional view enlarging the main part of the metallized film used in the metallized film capacitor 従来の金属化フィルムコンデンサの構成を示した断面図Sectional view showing the structure of a conventional metallized film capacitor 同金属化フィルムコンデンサに使用される第１蒸着電極の平面図Top view of the first vapor deposition electrode used in the metallized film capacitor 同第２蒸着電極の平面図Plan view of the second vapor deposition electrode 金属化フィルムにオイル保護膜を形成する製造装置の要部を拡大した断面図Sectional drawing which expanded the principal part of the manufacturing apparatus which forms an oil protective film in a metallized film

符号の説明Explanation of symbols

１ 誘電体フィルム
２ 金属蒸着電極
３ 絶縁マージン
４ オイル保護膜
５ メタリコン電極
６ 低抵抗部 DESCRIPTION OF SYMBOLS 1 Dielectric film 2 Metal vapor deposition electrode 3 Insulation margin 4 Oil protective film 5 Metallicon electrode 6 Low resistance part

Claims (1)

誘電体フィルム上に金属蒸着電極を形成した金属化フィルムを一対とし、金属蒸着電極が誘電体フィルムを介して対向するように重ね合わせて巻回した素子と、この素子の両端面に金属溶射によって形成された一対のメタリコン電極からなる金属化フィルムコンデンサにおいて、金属化フィルムとして、誘電体フィルムの幅方向の一端側に非金属蒸着部からなる絶縁マージンを長手方向に連続して設け、この絶縁マージンを除く部分に金属蒸着電極を形成すると共に、金属化フィルムの一端側に設けた絶縁マージンと異なる側の端部に、金属蒸着電極を厚く形成して抵抗値を低くした低抵抗部を設け、絶縁マージンを除いて形成された金属蒸着電極上にオイル保護膜を形成し、低抵抗部上に形成するオイル保護膜の厚みを、低抵抗部を除く金属蒸着電極上に形成されたオイル保護膜の厚さの９０％以下とした金属化フィルムコンデンサ。 The metallized film forming a metal deposition electrode on the dielectric film and a pair, and the element metallic deposition electrode wound superposed so as to face each other with a dielectric film, a metal to both end surfaces of the element In a metallized film capacitor composed of a pair of metallicon electrodes formed by thermal spraying, as a metallized film, an insulating margin composed of a non-metal vapor-deposited portion is continuously provided in the longitudinal direction on one end side in the width direction of the dielectric film. A metal vapor deposition electrode is formed in a portion excluding the insulation margin, and a low resistance portion having a low resistance value by forming a metal vapor deposition electrode thickly at an end portion different from the insulation margin provided on one end side of the metallized film. provided to form an oil protective film on the metal deposition electrode formed except insulation margin, the thickness of the oil protective film formed on the low-resistance portion, gold except for a low resistance portion 90% of the thickness below the metal films capacitor oil protective film formed on the deposition electrode.
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