JP2014220400A - Metalization film capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metalization film capacitor in which electrical connection of the end face electrodes of two metalization films is suppressed when the capacitor is cut.SOLUTION: A metal electrode 26 is constituted of an electrode part 26a arranged while spaced apart from an end face electrode 28, and an electrode part 26c to be connected with the end face electrode 28. Since the metal electrode 26 of a metalization film 22b is formed in a shape overlapping the metal electrode 26 of a metalization film 22a when it is rotated by 180 degrees, and the metalization film 22b is laminated on the metalization film 22a while being shifted in a direction perpendicular to the arrangement direction, electrical connection of the end face electrodes 28 of two metalization films 22a, 22b is suppressed when a metalization film capacitor 20 is cut.

Description

  The present invention relates to a metallized film capacitor, and more specifically, a dielectric film, a plurality of metal electrodes arranged in a row with a gap on the surface of the dielectric film, and a plurality of metal electrodes formed on one end surface of the dielectric film. And an end face electrode connected to the metallized film capacitor.

  Conventionally, as this type of metallized film capacitor, one having a double-sided metallized film in which metal-deposited electrodes are formed on both sides of a dielectric film has been proposed (for example, see Patent Document 1). In this capacitor, the fuse part functions even when dielectric breakdown occurs in a part of the dielectric film by connecting the micro-evaporated metal subdivided into a plurality of metal evaporated electrodes via the fuse part. Since the minute vapor deposited metal in the portion where the dielectric breakdown has occurred is electrically cut off from the entire capacitor, the entire capacitor can be prevented from being broken down.

Japanese Patent Laid-Open No. 10-149939

  By the way, two metallizations comprising a dielectric film, a plurality of metal electrodes arranged in a row on the surface of the dielectric film, and an end face electrode formed on the end face of the dielectric film and connected to the plurality of metal electrodes. When a metallized film capacitor formed by laminating films is cut to form a capacitor element, the capacitor element may not function as a capacitor depending on the cutting position. For example, when a metallized film capacitor is cut at the position of the metal electrode, the metallized film is stretched at the cut surface due to heat and stress at the time of cutting, and the metal electrodes of the two metallized films are short-circuited. The end face electrodes of the two metallized films are electrically connected to each other, and the capacitor element does not function as a capacitor. It is desirable that the electrical connection between the end face electrodes is suppressed.

  The main object of the present invention is to provide a metallized film capacitor in which the end face electrodes of two metallized films are suppressed from being electrically connected when cut.

  The metallized film capacitor of the present invention employs the following means in order to achieve the main object described above.

The metallized film capacitor of the present invention is
A dielectric film; a plurality of metal electrodes arranged in a line on the surface of the dielectric film with a gap; and an end face electrode formed on one end face of the dielectric film and connected to the plurality of metal electrodes. A metallized film capacitor in which two metallized films are laminated,
The metal electrode is
A first electrode portion disposed away from the end face electrode;
A second electrode part formed on one end face of the first electrode part in the arrangement direction of the metal electrodes, and connecting the first electrode part and the end face electrode;
The main point is to have

  In this metallized film capacitor according to the present invention, the first electrode part of the metal electrode is arranged away from the end face electrode, and the second electrode part is formed on one end face of the first electrode part. When a capacitor element is manufactured by cutting the film in a direction substantially perpendicular to the arrangement direction of the metal electrodes, the metallized film capacitor is cut at the first electrode part, and the first electrode parts of the two metallized films are cut at the cut surface. Even if is short-circuited, the first electrode portion on the cut surface and the end surface electrode are not connected. Thereby, it can suppress that the end surface electrodes of two metallized films are electrically connected.

  In such a metallized film capacitor of the present invention, the two metallized films are obtained by rotating one metallized film 180 degrees when the metal electrode of the one metallized film, the end face electrode, and the other metallized film. The metal electrode and the end face electrode of the film may be formed so as to overlap each other. If it carries out like this, even if a metallized film capacitor is cut | disconnected by a 2nd electrode part, it can suppress that the 1st electrode part and 2nd electrode part of two metallized films are short-circuited by a cut surface. It can suppress that the end surface electrodes of two metallized films are electrically connected. In this case, when the two metallized films are laminated, the first electrode part of the metal electrode of the one metallized film overlaps the second electrode part of the metal electrode of the other metallized film. It is also possible to stack them while being shifted in a direction substantially perpendicular to the arrangement direction. If it carries out like this, when cutting a metallized film capacitor | condenser and forming a capacitor | condenser element, it can suppress more that the end surface electrodes of two metallized films are electrically connected.

It is an external view which shows the outline of a structure of the metallized film capacitor 20 used as the base material of the capacitor | condenser element as one Example of this invention. 2 is an external view showing a configuration of a main part of a metallized film capacitor 20. FIG. It is sectional drawing in the CC line of FIG. It is sectional drawing in the DD line of FIG. It is explanatory drawing which shows the external appearance of the capacitor | condenser elements 30a and 30b at the time of cut | disconnecting the metallized film capacitor | condenser 20 in the position of CC line in FIG. It is explanatory drawing which shows the external appearance of the capacitor | condenser elements 30a and 30b at the time of cut | disconnecting the metallized film capacitor 20 in the position of the EE line | wire in FIG.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is an external view showing an outline of a configuration of a metallized film capacitor 20 that is a base material of a capacitor element as one embodiment of the present invention, and FIG. 2 is an external view showing a configuration of a main part of the metalized film capacitor 20. 3 is a cross-sectional view taken along line CC of FIG. 2, and FIG. 4 is a cross-sectional view taken along line DD of FIG. The metallized film capacitor 20 is configured by laminating and winding metallized films 22 a and 22 b in which a plurality of metal electrodes 26 are formed on the surface of a dielectric film 24.

  The metallized films 22a and 22b are a dielectric film 24 having a thickness of several μm formed of polypropylene, polyester, or the like, and a direction wound around the surface of the dielectric film 24 with a gap (direction of arrow A in FIG. 1). And a plurality of metal electrodes 26 arranged in a row, and an end face electrode 28 formed as a metallized electrode sprayed with a metal material such as aluminum or zinc on one end face of the dielectric film 24 and connected to the metal electrode 26. ing.

  The metal electrode 26 of the metallized films 22a and 22b is formed by vapor-depositing a metal material such as aluminum or zinc, and the electrode part 26a disposed away from the end face electrode 28 is wound around the electrode part 26a. The electrode portion 26 c is formed on the end surface 26 b in the direction in which the metal electrodes 26 are arranged, and connects the electrode portion 26 a and the end surface electrode 28. The electrode part 26a has a fuse part 26d having a narrow width, the width W1 in the arrangement direction of the fuse part 26d is several mm, and the width W2 in the arrangement direction of other parts excluding the fuse part 26d is several mm. As a whole, the length L1 in the direction perpendicular to the arrangement direction (the direction of arrow B in the figure) is several tens of mm, and the gap S1 between the electrode portions 26a of the adjacent metal electrodes 26 is several mm. The electrode part 26c is formed such that the gap between the adjacent metal electrode 26 and the electrode part 26a is several hundred μm.

  The metallized film 22b is shifted in a direction perpendicular to the arrangement direction so that the electrode part 26a of the metal electrode 26 of the metallized film 22a and the electrode part 26c of the metal electrode 26 of the metallized film 22a do not overlap. It is laminated on 22a. The electrode part 26a of the metallized film 22b is formed in a shape that overlaps with the electrode part 26a of the metallized film 22a when the metallized film 22a is rotated 180 degrees.

  The metallized film capacitor 20 thus configured is cut to a length (for example, a position indicated by a broken line in FIG. 1) according to a required capacitor capacity in a direction perpendicular to the arrangement direction, thereby obtaining a desired capacity. Capacitor elements can be manufactured.

  FIG. 5 is an explanatory view showing the appearance of the capacitor elements 30a and 30b when the metallized film capacitor 20 is cut at the position of the CC line in FIG. Here, the capacitor element 30a is considered. During such cutting, the metallized films 22a and 22b may be stretched at the cut surface due to frictional heat or physical stress. In the part where the dielectric film 24 of the metallized films 22a and 22b is exposed, even if the metallized films 22a and 22b are stretched, the short circuit between the metal electrodes 26 of the metallized films 22a and 22b hardly occurs. The end face electrodes 28 are hardly electrically connected. Further, the metal electrode 26 is formed so as to overlap when the metallized film 22a is rotated 180 degrees, and the electrode part 26a of the metal electrode 26 of the metallized film 22a and the electrode part 26c of the metal electrode 26 of the metallized film 22b The metallized film 22a is laminated on the metallized film 22a so as not to overlap with each other in the direction perpendicular to the arrangement direction. 24 is exposed. Therefore, even if the metallized films 22a and 22b are stretched, the short-circuit between the metal electrodes 26 of the metallized film 22a hardly occurs, and the end face electrodes 28 are hardly electrically connected. As described above, the metallized film 22b is formed in a shape so that the metal electrode 26 overlaps when the metallized film 22a is rotated 180 degrees, and the metallized film 22b is shifted in a direction perpendicular to the arrangement direction. When the metallized film capacitor 20 is cut at the position of the CC line, the end face electrodes 28 of the metallized films 22a and 22b are electrically connected to each other so that the capacitor elements 30a and 30b serve as capacitors. It is possible to suppress the malfunction.

  FIG. 6 is an explanatory view showing the appearance of the capacitor elements 30a and 30b when the metallized film capacitor 20 is cut at the position of the EE line in FIG. When cut at the position of the EE line, the capacitor element 30a is exposed in the cross section to the electrode portion 26a of the metal electrode 26 of the metallized films 22a, 22b. Therefore, when the metallized films 22a, 22b are stretched, the metal The electrode portions 26a of the metal electrodes 26 of the chemical films 22a and 22b may be short-circuited. In this case, since the electrode part 26a is disposed at a position separated from the end face electrode 28 and the electrode part 26a is not connected to the end face electrode 28, the electrode parts 26a of the metal electrodes 26 of the metallized films 22a and 22b are connected to each other. Even if a short circuit occurs, the end face electrodes 28 of the metallized films 22a and 22b are not electrically connected. Thus, by arranging the electrode part 26a at a position separated from the end face electrode 28, it is possible to suppress the end face electrodes 28 of the metallized films 22a and 22b from being electrically connected to each other.

  In the metallized film capacitor 20 of the embodiment described above, the metal electrode 26 is composed of an electrode part 26a disposed away from the end face electrode 28 and an electrode part 26c connected to the end face electrode 28, and the metallized film 22b. When the metallized film 22a is rotated 180 degrees, the metal electrode 26 is formed in a shape overlapping the metal electrode 26 of the metallized film 22a, and the metallized film 22b is perpendicular to the arrangement direction with respect to the metallized film 22a. Since the metallized film 22a is laminated in a shifted direction, it is possible to prevent the end face electrodes 28 of the metallized films 22a and 22b from being electrically connected when the metallized film capacitor 20 is cut.

  In the metallized film capacitor 20 of the example, the metallized film 22b is laminated on the metallized film 22a in a direction perpendicular to the arrangement direction with respect to the metallized film 22a. However, the metallized film 22b is displaced. It is good also as what is laminated | stacked on the metallized film 22a without.

  In the metallized film capacitor 20 of the example, the metal electrode 26 of the metallized film 22b is formed in a shape overlapping the metal electrode 26 of the metallized film 22a when the metallized film 22a is rotated 180 degrees. The metal electrode 26 of the metallized film 22b may have a shape that does not overlap the metal electrode 26 of the metallized film 22a when the metallized film 22a is rotated 180 degrees.

  In the metallized film capacitor 20 of the embodiment, the metallized films 22a and 22b are wound. However, the metallized film capacitor 20 may not be wound.

  In the metallized film capacitor 20 of the embodiment, the dielectric film 24 is formed to a thickness of several μm, the fuse part of the electrode part 26a of the metal electrode 26 has a width in the arrangement direction of several mm, and other parts excluding the fuse part The width in the arrangement direction is several tens mm as a whole, the gap between the adjacent metal electrode 26 and the electrode part 26a is several mm, and the electrode part 26c is the electrode part of the adjacent metal electrode 26. Although the gap with 26a is formed to be several hundred μm, these dimensions are merely examples, and may be appropriately changed.

  In the metallized film capacitor 20 of the example, the metal electrode 26 is formed by vapor deposition and the end face electrode 28 is a metallicon electrode, but may be formed by other methods.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the dielectric film 24 corresponds to the “dielectric film”, the metal electrode 26 corresponds to the “metal electrode”, the end face electrode 28 corresponds to the “end face electrode”, and the metallized films 22 a and 22 b “ The electrode portion 26a corresponds to the “first electrode portion”, and the electrode portion 26c corresponds to the “second electrode portion”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention is applicable to the metallized film capacitor manufacturing industry.

  20 Metallized film capacitor, 22a, 22b Metallized film, 24 Dielectric film, 26 Metal electrode, 26a, 26c Electrode part, 26b End face, 26d Fuse part, 28 End face electrode, 30a, 30b Capacitor element.

Claims (3)

A dielectric film; a plurality of metal electrodes arranged in a line on the surface of the dielectric film with a gap; and an end face electrode formed on one end face of the dielectric film and connected to the plurality of metal electrodes. A metallized film capacitor in which two metallized films are laminated,
The metal electrode is
A first electrode portion disposed away from the end face electrode;
A second electrode part formed on one end face of the first electrode part in the arrangement direction of the metal electrodes, and connecting the first electrode part and the end face electrode;
A metallized film capacitor. The metallized film capacitor of claim 1,
The two metallized films include the metal electrode and the end face electrode of the one metallized film and the metal electrode and the end face electrode of the other metallized film when the one metallized film is rotated 180 degrees. A metalized film capacitor that is formed to overlap. A metallized film capacitor according to claim 2,
The two metallized films are arranged so that the first electrode part of the metal electrode of the one metallized film does not overlap the second electrode part of the metal electrode of the other metallized film in a stacked state. A metallized film capacitor that is laminated in a direction that is substantially perpendicular to the direction.

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