JP2005072294A - Metallization film capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metallization film capacitor for improving reliability by enabling good fuse operation. <P>SOLUTION: The width W2 of an electrode drawing metal region 5 is smaller than the width W of a metal region 4 contributed to a capacity. In other words, when the width W of the metal region 4 contributed to the capacity is compared with the width W2 of the electrode drawing metal region 5 and a width W1 of a fuse 6, the inequal relation W>W2>W1 is satisfied. The operability of a fuse between the metallikon and the electrode drawing metal region 5 can be arbitrarily set by making the length W2 of a connection part between a metallikon and the electrode drawing metal region 5 smaller than an electrode width W, and the fuse in accordance with the use of a capacitor can be set. The operability of the fuse between the metallikon and the electrode drawing metal region 5 and the operability of the fuse 6 can be made substantially similar, and the fuse can be surely operated during abnormality to surely prevent dielectric breakdown. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a metallized film capacitor.

  Conventionally, as a film for a metallized film capacitor having a security mechanism, those shown in FIGS. 5 and 6 are known. The metallized film shown in FIG. 5 has an end margin portion 21 extending in the longitudinal direction at one end thereof, and the first margin portion 22 extending in the width direction divides the deposited metal in the longitudinal direction with a predetermined width W. It has a structure. A pair of metallized films having such a structure is wound with a dielectric sandwiched between end margins 21 arranged in opposite directions and metallized at both ends to form a capacitor element. doing. Further, the metallized film shown in FIG. 6 has the end margin portion 21 and the first margin portion 22 in the same manner as described above, and further, on the side opposite to the end margin portion 21, at a slightly inward position. A second margin portion 23 extending in the longitudinal direction is formed. A metal region 24 that contributes to capacitance is formed between the end margin portion 21 and the second margin portion 23, and an electrode lead metal region 25 is formed outside the second margin portion 23. The metal region 24 contributing to the capacitance and the electrode lead metal region 25 are connected by a fuse portion 26 having a narrow width W1.

  By the way, the metallized film shown in FIG. 5 has a security mechanism using contact between the metallicon and the electrode lead metal region 25, but the fuse operation between the metallicon and the electrode lead metal region 25 is performed. Since it is difficult to control the current, there is a drawback that it is difficult to set for a good fuse operation. Further, in the metallized film shown in FIG. 6, a fuse part 26 is provided in the second margin part 23. Like the one shown in FIG. Difficult to operate fuse.

  The present invention has been made to solve the above-mentioned conventional drawbacks, and an object thereof is to provide a metallized film capacitor capable of good fuse operation and improving its reliability. It is in.

  The metallized film capacitor according to claim 1, wherein the metallized film capacitor has metal vapor-deposited electrodes facing each other with a dielectric interposed therebetween, and at least one of the opposed metal vapor-deposited electrodes separates the metal vapor-deposited electrodes in the longitudinal direction of the film. A second margin portion 3 having a first margin portion 2 and extending in the longitudinal direction of the film is formed, a fuse portion 6 is provided in the second margin portion 3, and an electrode lead metal connected to the fuse portion 6 By dividing the region 5 into a plurality in the longitudinal direction of the film and providing the third margin portion 7 connected to the second margin portion 3, the length W2 of the electrode lead metal region 5 in the film longitudinal direction is changed to the first margin portion. The metal region 4 that contributes to the capacity formed between the two regions is smaller than the length W in the longitudinal direction of the film.

  The metallized film capacitor according to claim 2 is a laminated metallized film capacitor having metal vapor deposition electrodes opposed to each other with a dielectric interposed therebetween, wherein at least one of the metal vapor deposition electrodes opposed to each other is a metal region 4 contributing to capacitance. It has a fuse portion 6 for connecting to the electrode lead metal region 5, and the length W2 along the electrode lead end surface of the electrode lead metal region 5 is made smaller than the width W of the metal region 4 contributing to the capacity. Yes.

  In the metallized film capacitor according to claim 1, the length of the connection portion between the metallicon and the electrode lead-out metal region 5 is made smaller than the width W of the metal region 4 that contributes to the capacity. The operability of the fuse with the metal region 5 can be arbitrarily set, and the fuse can be set according to the use of the capacitor. In addition, the fuse operability between the metallicon and the electrode lead metal region 5 and the operability of the fuse part 6 can be made almost the same, and the fuse operation can be surely performed at the time of abnormality to reliably prevent dielectric breakdown, A metallized film capacitor with improved reliability can be provided.

  In the metallized film capacitor according to the second aspect, the length W2 of the connecting portion between the metallicon and the electrode lead-out metal region 5 is made smaller than the width W of the metal region 4 contributing to the capacity, as in the first aspect. Thus, the operability of the fuse between the metallicon and the electrode extraction metal region 5 can be arbitrarily set, and the fuse can be set according to the use of the capacitor. In addition, the fuse operability between the metallicon and the electrode lead metal region 5 and the operability of the fuse part 6 can be made almost the same, and the fuse operation can be surely performed at the time of abnormality to reliably prevent dielectric breakdown, A metallized film capacitor with improved reliability can be provided.

  Next, specific embodiments of the metallized film capacitor of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a first embodiment. This metallized film has an end margin portion 1 extending in the longitudinal direction at one end thereof, and a structure in which the deposited metal is divided in the longitudinal direction by a predetermined width W at the first margin portion 2 extending in the width direction. doing. Further, on the side opposite to the end margin portion 1, a second margin portion 3 extending in the longitudinal direction of the film is formed at a slightly inner position, and a third margin portion 7 connected to the second margin portion 3 is provided. Forming. A metal region 4 that contributes to capacitance is formed between the end margin portion 1 and the second margin portion 3, and an electrode lead metal region 5 is formed outside the second margin portion 3. The electrode lead-out metal region 5 is also divided into a plurality in the longitudinal direction of the film. Further, the metal region 4 contributing to the capacitance and the electrode lead metal region 5 are connected by a fuse portion 6 having a narrow width W1. A characteristic feature of this metallized film is that by providing the third margin portion 7, the width W2 of the electrode lead metal region 5 is made smaller than the width W of the metal region 4 contributing to the capacity. It is. That is, when comparing the width W of the metal region 4 that contributes to the capacity, the width W2 of the electrode lead-out metal region 5, and the width W1 of the fuse portion 6, W> W2> W1. A pair of metallized films having such a structure is wound with a dielectric sandwiched between end margins 1 arranged in opposite directions, and metallized at both ends, thereby providing a capacitor element. Is forming.

  In the metallized film capacitor, the length W2 of the connecting portion between the metallicon and the electrode lead-out metal region 5 is made smaller than the electrode width W, so that the fuse between the metallicon and the electrode lead-out metal region 5 is reduced. The operability can be set arbitrarily, and the fuse can be set according to the use of the capacitor. In addition, the fuse operability between the metallicon and the electrode lead metal region 5 and the operability of the fuse part 6 can be made almost the same, and the fuse operation can be surely performed at the time of abnormality to reliably prevent dielectric breakdown, A metallized film capacitor with improved reliability can be provided.

  FIG. 2 shows a second embodiment. In this embodiment, two (a plurality of) electrode lead metal regions 5 and 5 are provided for one capacity-contributing metal region (metal region contributing to the capacity) 4. Each of them is configured to be connected to the capacitance-contributing metal region 4 via the fuse portions 6 and 6. FIG. 3 shows a third embodiment. In this embodiment, one electrode lead metal region 5 is provided for one capacitance-contributing metal region 4, and the electrode lead metal region 5 is provided. Are connected to the capacitance-contributing metal region 4 via two (plural) fuse portions 6, 6. In each of these embodiments, substantially the same operations and effects as in the first embodiment can be obtained.

  FIG. 4 shows a fourth embodiment (corresponding to claim 2) applied to a laminated metallized film capacitor. That is, as shown in the figure, in this metallized film capacitor, the metal region 4 contributing to the capacitance and the electrode lead metal region 5 are connected by the fuse portion 6 and along the electrode lead end surface of the electrode lead metal region 5. The length W2 is made smaller than the width W of the metal region 4 contributing to the capacity. Also in this embodiment, substantially the same operations and effects as in the first embodiment can be obtained.

  Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention.

It is a top view which shows 1st Embodiment of the metallized film used for the metallized film capacitor of this invention. It is a top view which shows 2nd Embodiment of a metallized film. It is a top view which shows 3rd Embodiment of a metallized film. It is a perspective view which shows 4th Embodiment applied to the laminated metallized film capacitor. It is a top view which shows the conventional metallized film. It is a top view which shows the other conventional example of a metallized film.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 End margin part 2 1st margin part 3 2nd margin part 4 Metal region which contributes to capacity | capacitance 5 Electrode extraction metal region 6 Fuse part 7 3rd margin part

Claims (2)

In a metallized film capacitor having metal vapor deposition electrodes facing each other with a dielectric interposed therebetween, at least one of the metal vapor deposition electrodes facing each other has a first margin portion (2) for dividing the metal vapor deposition electrode in the longitudinal direction of the film. In addition, a second margin portion (3) extending in the longitudinal direction of the film is formed, a fuse portion (6) is provided in the second margin portion (3), and an electrode lead metal region connected to the fuse portion (6) ( 5) is divided into a plurality of portions in the longitudinal direction of the film, and the third margin portion (7) connected to the second margin portion (3) is provided, whereby the length of the electrode lead metal region (5) in the longitudinal direction of the film (5) W2) is made smaller than the length (W) in the film longitudinal direction of the metal region (4) contributing to the capacity formed between the first margin portions (2). Of film capacitor. In a laminated metallized film capacitor having metal vapor deposition electrodes facing each other with a dielectric interposed therebetween, at least one of the metal vapor deposition electrodes facing each other includes a metal region (4) contributing to capacity and an electrode lead metal region (5). The length (W2) along the electrode lead end face of the electrode lead metal region (5) is made smaller than the width (W) of the metal region (4) contributing to the capacitance. A laminated metallized film capacitor characterized by the above.