JP4733533B2 - Metallized film capacitor and manufacturing method thereof - Google Patents

Metallized film capacitor and manufacturing method thereof Download PDF

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JP4733533B2
JP4733533B2 JP2006036477A JP2006036477A JP4733533B2 JP 4733533 B2 JP4733533 B2 JP 4733533B2 JP 2006036477 A JP2006036477 A JP 2006036477A JP 2006036477 A JP2006036477 A JP 2006036477A JP 4733533 B2 JP4733533 B2 JP 4733533B2
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film
metallized film
metallized
capacitor
winding
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JP2007220720A (en
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一司 佐藤
朗 菊地
雅憲 石川
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AAFC Energy Technology Inc.
Hitachi AIC Inc
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AAFC Energy Technology Inc.
Hitachi AIC Inc
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Description

本発明は， 金属化フィルムコンデンサおよびその製造方法に関する。特に、収容率に優位なフィルムコンデンサの偏平素子およびその製造方法に関する。
The present invention relates to a metallized film capacitor and a method for manufacturing the same . In particular, the present invention relates to a flat element of a film capacitor superior in accommodation rate and a manufacturing method thereof .

従来、偏平素子からなる金属化フィルムコンデンサを製造する場合、金属蒸着フィルムを一対の半円柱形で構成される巻取り機の巻芯シャフト等により、このフィルムの端部をはさみこんで巻きつけ、この巻芯シャフトから素子を抜き取り後、ある程度作りためてから別工程でコンデンサ素子をプレスしてから固定具で固定しながら加熱するか、加熱しながらコンデンサ素子をプレスして偏平素子を得ていた（たとえば、特開２０００−１２３７１公報の従来の技術、図４）。次に端面に金属を溶射するメタリコンにより、電極引き出し部を設けていた。
特開２０００−１２３７１公報 Conventionally, when manufacturing a metallized film capacitor comprising a flat element, the end of the film is sandwiched between and wound by a winding shaft of a winder constituted by a pair of semi-cylindrical metal deposited films, After extracting the element from this core shaft, after making it to some extent, press the capacitor element in a separate process and then heat it while fixing it with a fixture, or press the capacitor element while heating to obtain a flat element (For example, the prior art of Unexamined-Japanese-Patent No. 2000-12371, FIG. 4). Next, an electrode lead-out portion was provided by a metallized metal sprayed on the end face.
JP 2000-12371 A

プラスチックフィルムに金属薄膜を成形した金属化フィルムを重ね巻回し、巻き止めとしてヒートシールをした後、コンデンサ素子をプレスして偏平素子にする際、プレス面にヒートシールヘッドによる凹凸の跡があると、その凹凸部がプレスにより内部の積層体にまで波及してその結果、積層体に歪またはしわが発生していた。この歪またはしわの発生により、交流成分の電圧印加によりうなり音増加や耐圧低下を招き、コンデンサ性能を低下させてしまう。   When a capacitor element is pressed into a flat element after a metallized film with a metal thin film formed on a plastic film is rolled and wound, and then heat-sealed as a stopper, the pressed surface has traces of unevenness due to the heat seal head. The uneven part spreads to the internal laminated body by pressing, and as a result, the laminated body was distorted or wrinkled. Due to the occurrence of distortion or wrinkle, the application of an AC component voltage causes an increase in beat sound and a decrease in breakdown voltage, thereby reducing the capacitor performance.

本発明は、以上の欠点を改良し、信頼性の高い金属化フィルムコンデンサ用の偏平素子を提供するものである。
This invention improves the above fault and provides the flat element for metallized film capacitors with high reliability.

本発明は、上記の課題を改善するために、プラスチックフィルムに金属薄膜を成形した金属化フィルムを重ね巻回し、巻き止めとしてヒートシールをした後、コンデンサ素子をプレスして曲線部分と平坦部分に偏平化した金属化フィルムコンデンサにおいて、前記フィルムの巻き止め部が、前記プレスのプレス面を避けた前記曲線部分にあることを特徴とする金属化フィルムコンデンサを提供するものである。
また、プラスチックフィルムに金属薄膜を成形した金属化フィルムを重ね巻回し、巻き止めとしてヒートシールをした後、コンデンサ素子をプレスして曲線部分と平坦部分に偏平化した金属化フィルムコンデンサの製造方法において、前記フィルムの巻き止め部が、前記プレスのプレス面を避けた前記曲線部分にあることを特徴とする金属化フィルムコンデンサの製造方法を提供するものである。
In order to improve the above-mentioned problems, the present invention is to wrap a metallized film formed of a metal thin film on a plastic film, heat seal it as a winding stop, and then press the capacitor element to make a curved part and a flat part. In the flattened metallized film capacitor, the metallized film capacitor is characterized in that an anti-winding portion of the film is located in the curved portion avoiding the press surface of the press .
In addition, in a method of manufacturing a metallized film capacitor in which a metallized film in which a metal thin film is formed on a plastic film is rolled and heat-sealed as a stopper, the capacitor element is pressed and flattened into a curved part and a flat part. The method for producing a metallized film capacitor is characterized in that the film winding-preventing portion is located in the curved portion avoiding the pressing surface of the press.

以上の通り本発明によれば、ヒートシールヘッドによる凹凸の跡があるフィルムの巻き止め端部を曲線部分に位置決めすることにより、素子を偏平化するときに、そのフィルムの巻き止め端部をプレス面から避ける。そのためその部分が内部の積層体にその凹凸部が波及することもなく、積層体に発生していた歪またはしわを防止できる。この歪またはしわの防止により、うなり音増加や耐圧低下を招く問題を解決し、信頼性の高いフィルムコンデンサ用の偏平素子を提供することができる。
As described above, according to the present invention, when the element is flattened by positioning the winding end of the film with traces of unevenness by the heat seal head on the curved portion, the winding end of the film is pressed. Avoid from the surface. Therefore, the uneven part does not spill over to the inner laminate, and the distortion or wrinkle generated in the laminate can be prevented. By preventing this distortion or wrinkle, it is possible to solve the problems that cause an increase in beat sound and a decrease in breakdown voltage, and to provide a highly reliable flat element for a film capacitor.

以下、本発明の実施の形態を図面に基づいて説明する。
図１は、フィルムコンデンサ用素子の巻取り前の概略断面図を示している。
１は、先巻フィルムで、フィルムコンデンサ素子の巻芯となる６μｍから２５μｍ程度の厚さのフィルムである。
２は、プラスチックフィルムに金属薄膜を成形した金属化フィルムで、先巻フィルム１の後に巻かれる。蒸着などにより設けた金属薄膜３が積層していて、コンデンサの耐圧に適合して選定した１μｍから１０μｍ程度の厚さのフィルムで、幅方向に０．５ｍｍから３ｍｍ程度ずらして２枚のフィルムを積層して巻かれる。金属化フィルム２の少なくとも片方のフィルムの少なくとも片方の端部をいわゆるバーンオフ４して金属薄膜３を除去しておくことや、２枚のうち、一方の金属化フィルムの長さを変えることにより、金属化フィルム２間のショートを防止することができる。
５は、後巻フィルムで、金属化フィルム２の後に巻かれる１０μｍから２５μｍ程度の厚さのフィルムである。先巻フィルム１と後巻フィルム５は、金属化フィルム２のバーンオフ４部分で代用してもかまわない。
フィルムコンデンサ用素子は、円筒形に巻取り後、後巻フィルム５の最後の部分で、外側からヒートシールヘッド７を押し当て、巻き止めする。巻回積層された後巻フィルム５を互いに熱溶融（ヒートシール）することにより巻取りが固定される。ヒートシールヘッド７は、たとえば底面の一辺が１ｍｍから４ｍｍ程度の四角錐を間欠的に一列に並べたようなものまたは底面の一辺が０．３ｍｍから６ｍｍ程度の線状を間欠的に一列に並べたようなものを使用する。最後に巻き止め部分より先の部分と分離する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic cross-sectional view of a film capacitor element before winding.
Reference numeral 1 denotes a pre-wound film, which is a film having a thickness of about 6 μm to 25 μm and serves as a core of a film capacitor element.
Reference numeral 2 denotes a metallized film obtained by forming a metal thin film on a plastic film, and is wound after the pre-winding film 1. A metal thin film 3 provided by vapor deposition or the like is laminated, and is a film having a thickness of about 1 μm to 10 μm selected according to the withstand voltage of the capacitor, and the two films are shifted by about 0.5 mm to 3 mm in the width direction. Laminated and wound. By removing the metal thin film 3 by so-called burn-off 4 at least one end of at least one of the metallized films 2 or by changing the length of one of the two metallized films, A short circuit between the metallized films 2 can be prevented.
Reference numeral 5 denotes a post-wound film, which is a film having a thickness of about 10 μm to 25 μm wound after the metallized film 2. The first roll film 1 and the second roll film 5 may be replaced by the burn-off 4 portion of the metallized film 2.
The film capacitor element is wound into a cylindrical shape, and the heat seal head 7 is pressed from the outside at the last part of the rear film 5 to be wound. The winding is fixed by heat-melting (heat-sealing) the wound film 5 after being wound and laminated. For example, the heat seal head 7 is formed by intermittently arranging a linear pyramid having a bottom side of about 1 mm to 4 mm in a row or a linear shape having a bottom side of about 0.3 mm to 6 mm in a row. Use something like that. Finally, it is separated from the part ahead of the winding part.

図２は、本発明の、フィルムコンデンサ用素子の巻取り後、コンデンサ素子をプレスした後の概略断面図を示している。
図２（ａ）は、全体図、図２（ｂ）は、巻き止め部分の拡大図を９０度時計と反対方向に回転して示している。
フィルムコンデンサ用素子は、円筒形に巻取り後、巻き止め部分を外側からヒートシールヘッド７を押し当て、巻回積層された後巻フィルム５を互いに熱溶融（ヒートシール）することにより巻取りが固定されるが、このとき、このヒートシールヘッドは、後巻フィルムを押しのけるようにヒートシールされるので、後巻フィルムにはヒートシールヘッドによる凹部とその周りには凸が形成される。また、金属化フィルム２までこの変形が及ばないように後巻フィルムの巻回を重ね積層する。
次に、コンデンサ素子をプレスして曲線部分と平坦部分に偏平化するときに、フィルムの巻き止め部であるヒートシール部６を前記曲線部分に設ける。このように曲線部分に設けることにより、ヒートシール部６がプレスにより押しつけられることから免れる。 FIG. 2 shows a schematic cross-sectional view after pressing the capacitor element after winding the film capacitor element of the present invention.
2A is an overall view, and FIG. 2B is an enlarged view of a winding stop portion rotated in the direction opposite to the 90-degree clock.
The film capacitor element is wound by winding it into a cylindrical shape and then pressing the heat seal head 7 against the winding stop from the outside and heat-melting (heat-sealing) the wound film 5 wound and laminated together. At this time, the heat seal head is heat-sealed so as to push away the latter film, so that the rear film has a recess formed by the heat seal head and a protrusion around the recess. Further, the subsequent film is wound and laminated so that this deformation does not reach the metallized film 2.
Next, when the capacitor element is pressed and flattened into a curved portion and a flat portion, a heat seal portion 6 that is a film winding portion is provided on the curved portion. By providing the curved portion in this way, the heat seal portion 6 can be avoided from being pressed by the press.

ところで、比較例として図３（ａ）に示すように、コンデンサ素子をプレスして曲線部分と平坦部分に偏平化するときに、フィルムの巻き止め部であるヒートシール部６を前記平坦部分に設け、プレスすると、図３(ｂ)の巻き止め部分の拡大図に示すように、ヒートシール部６の段差により金属化フィルム２と金属薄膜３が屈曲し、積層体に歪またはしわ８が発生することを示している。
この段差により特に金属化フィルム２にストレスがかかりやすい。
By the way, as shown in FIG. 3A as a comparative example, when the capacitor element is pressed and flattened into a curved portion and a flat portion, a heat seal portion 6 that is a film winding portion is provided in the flat portion. When pressed, the metallized film 2 and the metal thin film 3 are bent by the step of the heat seal portion 6 as shown in the enlarged view of the winding portion in FIG. 3B, and the laminate is distorted or wrinkled 8. It is shown that.
Due to this level difference, the metallized film 2 is particularly stressed.

フィルムコンデンサ用素子の巻取り前の概略断面図を示す。The schematic sectional drawing before winding up the element for film capacitors is shown. 本発明の実施形態の概略断面図と拡大部分断面図を示す。The schematic sectional drawing and enlarged partial sectional view of embodiment of this invention are shown. 比較例の概略断面図と拡大部分断面図を示す。The schematic sectional drawing and enlarged partial sectional view of a comparative example are shown.

符号の説明Explanation of symbols

１…先巻フィルム、２…金属化フィルム、３…金属薄膜、４…バーンオフ、５…後巻フィルム、
６…ヒートシール部、７…ヒートシールヘッド、８…歪またはしわ部。 DESCRIPTION OF SYMBOLS 1 ... First winding film, 2 ... Metallized film, 3 ... Metal thin film, 4 ... Burn-off, 5 ... Later winding film,
6 ... Heat seal part, 7 ... Heat seal head, 8 ... Strain or wrinkle part.

Claims (2)

プラスチックフィルムに金属薄膜を成形した金属化フィルムを重ね巻回し、巻き止めとしてヒートシールをした後、コンデンサ素子をプレスして曲線部分と平坦部分に偏平化した金属化フィルムコンデンサにおいて、前記フィルムの巻き止め部が、前記プレスのプレス面を避けた前記曲線部分にあることを特徴とする金属化フィルムコンデンサ。 In a metallized film capacitor in which a metallized film in which a metal thin film is formed on a plastic film is rolled and heat-sealed as a stopper, the capacitor element is pressed to flatten the curved part and the flat part. A metallized film capacitor characterized in that a stop portion is on the curved portion avoiding the press surface of the press . プラスチックフィルムに金属薄膜を成形した金属化フィルムを重ね巻回し、巻き止めとしてヒートシールをした後、コンデンサ素子をプレスして曲線部分と平坦部分に偏平化した金属化フィルムコンデンサの製造方法において、前記フィルムの巻き止め部が、前記プレスのプレス面を避けた前記曲線部分にあることを特徴とする金属化フィルムコンデンサの製造方法。  In the method of manufacturing a metallized film capacitor in which a metallized film in which a metal thin film is formed on a plastic film is rolled and heat-sealed as a winding stopper, the capacitor element is pressed and flattened into a curved part and a flat part. A method for producing a metallized film capacitor, wherein the film winding-preventing portion is located on the curved portion avoiding the pressing surface of the press.
JP2006036477A 2006-02-14 2006-02-14 Metallized film capacitor and manufacturing method thereof Expired - Fee Related JP4733533B2 (en)

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JP2009277865A (en) * 2008-05-14 2009-11-26 Daikin Ind Ltd Film capacitor and its manufacturing method
US8228661B2 (en) 2009-08-10 2012-07-24 Kojima Press Industry Co., Ltd. Film capacitor and method of producing the same
JP6096091B2 (en) * 2013-09-30 2017-03-15 ニチコン株式会社 Capacitor element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5998639U (en) * 1982-12-22 1984-07-04 岡谷電機産業株式会社 flat wound capacitor
JPH09199372A (en) * 1996-01-19 1997-07-31 Shizuki Denki Seisakusho:Kk Winding type film capacitor and method for manufacturing winding type film capacitor
JP2003059753A (en) * 2001-08-21 2003-02-28 Nitsuko Electronics Corp Manufacturing method of film capacitor

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JPS5998639A (en) * 1982-11-27 1984-06-07 泓本　浩 Fishing line reinforced at hook part
JP2000012371A (en) * 1998-06-26 2000-01-14 Nitsuko Corp Manufacture of film capacitor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5998639U (en) * 1982-12-22 1984-07-04 岡谷電機産業株式会社 flat wound capacitor
JPH09199372A (en) * 1996-01-19 1997-07-31 Shizuki Denki Seisakusho:Kk Winding type film capacitor and method for manufacturing winding type film capacitor
JP2003059753A (en) * 2001-08-21 2003-02-28 Nitsuko Electronics Corp Manufacturing method of film capacitor

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