JP2003007560A - Metallized film capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metallized film capacitor which can improve quality by stabilizing performance. SOLUTION: In a metallized film 1 including a dielectric material film 2 and an electrode-deposited film 3 which is formed by metallizing the dielectric material film 2, a first margin 5 extending in the widthwise direction of the metallized film 1 is formed to divide the electrode deposited film 3 into a plurality of electrode regions in the longitudinal direction of the metallized film 1. Meanwhile, a second margin 6 is formed extendedly in the longitudinal direction of the metallized film 1, and non-continuous part of the second margin 6 is formed as a fuse 7. In this case, the second margins 6 provided adjacently via the fuse 7 should not be overlapped in the longitudinal direction and widthwise direction of the metallized film 1.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metallized film capacitor having a self-protection function. FIG. 6 shows the structure of a metallized film 10 of a conventional metallized film capacitor. As shown in the figure, the metallized film 10 is a dielectric film 11
And one end of the surface of the dielectric film 11 in the width direction,
The electrode deposition film 12 is formed by metal deposition except for the edge insulating band 13. The metallized film 10 has first margins 14 (14) extending in the width direction of the metallized film 10 such that the electrode-deposited film 12 is divided into a plurality of electrode regions in the longitudinal direction of the metallized film 10. A plurality of portions without vapor deposition) are formed at predetermined intervals. A second margin 1 extending discontinuously in the longitudinal direction is provided at the other end in the width direction of the metallized film 10.
5, 15 are formed, and the second margin portion 15,
The discontinuous portion between the portions 15 functions as the fuse portion 16. At this time, each of the margin portions 14,
The fuse portion 16 (a portion having a smaller current capacity than other portions) is formed in each of the plurality of electrode regions divided by the fuse region 15 so that the short-circuit current at the time of dielectric breakdown can be reduced by the fuse function. To cut off the electrode area of the dielectric breakdown part,
Thereby, it is configured that loss of the entire function as a capacitor can be prevented. Here, each of the margin portions 14 and 15 is
It is formed by a method called a printing roll method. With the printing roll method, before depositing metal on the dielectric film 11, a masking oil for preventing metal deposition is applied in advance to the positions where the margin portions 14 and 15 are formed using a printing roll, Thereafter, a method of forming the margin portions 14 and 15 by depositing a metal is referred to. Specifically, the margins 14 and 15 are arranged in the circumferential direction of the side surface of the substantially cylindrical print roll (not shown).
The masking oil is supplied to the projecting portion, and a masking oil is supplied to the projecting portion, and the projecting portion to which the oil is adhered is pressed onto the surface of the dielectric film 11 to mask the surface of the dielectric film 11. It is configured to apply oil. By the way, the second margin portion 15 extending discontinuously is provided with the margin portion 15.
Are formed by using print rolls provided with protrusions corresponding to the width and the length of the print roll at regular intervals. At this time, the interval between the concave portions formed between the protruding portions of the printing roll corresponds to the width of the fuse portion 16 formed between the second margin portions 15.
Is formed in millimeters, so that the interval between the concave portions formed in the printing roll is also very small, which is in millimeters. For this reason, if too much oil is supplied to the protrusions of the printing roll, oil accumulates in the recesses between the protrusions to cause a bridge, or the oil accumulated in the recesses is applied to the dielectric film 11. Occasionally, a bridge may be formed between the ends of the oil application pattern corresponding to the second margin portions 15, 15 due to dripping or the like. However, when such a bridge occurs, the second margin portions 15 formed after the above-described metal deposition are connected to each other, so that there is a problem that a good fuse portion 16 cannot be formed. In order to solve this problem, if the amount of oil supply is reduced, there will be a part where oil is not sufficiently applied and oil shortage will occur. There is also a problem that the fuse operation is adversely affected, such as functioning.
As a result, there is a problem that the performance as a metallized film becomes unstable and the productivity also deteriorates. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and has as its object to provide a metallized film capacitor capable of improving quality by stabilizing performance. It is in. Accordingly, a metallized film capacitor according to claim 1 is a metallized film 1 having a dielectric film 2 and an electrode-deposited film 3 metal-deposited on the dielectric film 2. A first electrode extending in the width direction of the metallized film 1 such that the electrode deposited film 3 is divided into a plurality of electrode regions in the longitudinal direction of the metallized film 1;
While forming the margin portion 5, the metallization is performed by forming a second margin portion 6 extending discontinuously in the longitudinal direction of the metallized film 1, and forming the discontinuous portion of the second margin portion 6 as a fuse portion 7. The film capacitor is characterized in that the second margin portions 6 adjacent via the fuse portion 7 do not overlap each other in the longitudinal direction and the width direction of the metallized film 1. According to the metallized film capacitor of the first aspect, the second margin portions adjacent to each other via the fuse portion are configured not to overlap in the longitudinal direction and the width direction of the metallized film. are doing. That is, this indicates that the end portions of the adjacent second margin portions 6 do not overlap with each other, whereby the adjacent protrusions of the printing roll for forming the second margin portion 6 are also aligned on the same straight line. Will not be formed. For this reason, even if the masking oil is sufficiently supplied to the protruding portion, it is possible to prevent the occurrence of a bridge between the ends of the oil application pattern corresponding to the second margin portion 6 due to oil dripping or the like. it can. In addition, this makes it possible to reliably secure the fuse portion 7 between the second margin portions 6 and 6 formed after the metal deposition, and excess vapor deposition metal in the second margin portion 6 due to insufficient oil supply. Adhesion can also be prevented. As a result, a good fuse operation can be obtained, so that the performance of the metallized film 1 can be stabilized and the quality can be improved. Next, specific embodiments of the metallized film capacitor of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic plan view showing the surface of a metallized film for explaining a metallized film capacitor according to an embodiment of the present invention. In FIG. 1, the metallized film 1 is composed of a dielectric film 2 and an electrode-deposited film 3 on which metal is vapor-deposited on one surface of the dielectric film 2. ,
An edge insulating band 4 (a portion where there is no evaporated metal) extending along the longitudinal direction of the metallized film 1 is formed. The metallized film 1 extends from one end to the other end in the width direction of the metallized film 1 so that the electrode-deposited film 3 is divided into a plurality of electrode regions in the longitudinal direction of the metallized film 1. A plurality of first margin portions 5 (portions without metal deposition) are formed at predetermined intervals. At the other end of the metallized film 1 in the width direction, a second margin portion 6 extending discontinuously in the longitudinal direction is formed, and a discontinuous portion between the second margin portions 6 is formed. It is configured to function as the fuse unit 7. More specifically, the discontinuous second margin portions 6 are alternately formed on two upper and lower straight lines extending substantially in parallel along the longitudinal direction of the metallized film 1. As shown in the partially enlarged view of FIG. 2, the end portion A of the upper second margin portion 6a adjacent via the fuse portion 7 and the start end portion B of the lower second margin portion 6b (or ,
The end of the lower second margin portion 6b and the start end of the upper second margin portion 6a are formed so as not to overlap in the longitudinal direction and the width direction of the metallized film 1. In this embodiment, the upper second margin portion 6a is formed so as to straddle the first margin portion 5, while the lower second margin portion 6b is formed so as to extend in the longitudinal direction of the metallized film 1. It is formed so as to be located between the second margin portions 6a, 6a. Also, here, FIG.
As shown in the figure, a lower side of the upper second margin portion 6a;
Although the upper side of the lower second margin portion 6b is formed on the same straight line, the upper second margin portion 6a and the lower second margin portion 6b are also formed in the longitudinal direction of the metallized film 1,
And the state where they do not overlap in the width direction. Here, each of the margins 5 and 6 has a projection corresponding to the width and length of the margins 5 and 6 formed of a masking oil for preventing metal adhesion before the metal is deposited. It is configured to be formed by applying in advance the portions of the dielectric film 2 where the margin portions 5 and 6 are to be formed using a printing roll (not shown). Further, a plastic film such as PET or PP is used as the dielectric film 2 in this embodiment, and aluminum, zinc, or a mixed metal thereof is used as a metal deposited on the dielectric film 1. Used. Then, the metallized films 1 formed as described above are made into a pair, and the edge insulating bands 4, 4 are formed.
Are arranged so as to be opposite to each other with the dielectric film 1 interposed therebetween, and a metallikon electrode (not shown) is formed on opposing end surfaces of a laminate formed by laminating a plurality of these to form a laminated type. A metallized film capacitor can be obtained. In addition, if the metallized films 1 stacked as a pair are wound and metallicon electrodes are formed on both ends of the wound film, a wound metallized film capacitor can be obtained. As described above, the ends A and B of the second margin portions 6a and 6b adjacent to each other via the fuse portion 7 are not overlapped in the longitudinal direction and the width direction of the metallized film 1. , The second margin portions 6 adjacent to each other are formed.
a, 6b are not formed on the same straight line, and in addition, the upper second margin portion 6a,
Since the intervals between the lower second margin portions 6b, 6b are increased, the intervals between the protruding portions of the printing rolls forming them (the intervals between the concave portions) are configured to be wider accordingly. . For this reason, even if the masking oil is sufficiently supplied to the protrusions of the printing roll, the oil accumulates in the recesses between the protrusions to cause a bridge, and the oil accumulated in the recesses is applied to the dielectric film 2. Preventing the second margin portions 6a, 6b from being connected to each other after metal deposition by causing a bridge between the ends of the oil application patterns corresponding to the second margin portions 6a, 6b due to dripping at the time of application. Can be. This makes it possible to reliably form the fuse portion 7 between the second margin portions 6a and 6b, and to prevent extra metal vapor deposition from adhering to the second margin portion 6 due to insufficient oil supply. You can also. As a result, a good fuse operation can be obtained, so that the performance of the metallized film 1 can be stabilized and the quality can be improved. Although the specific embodiments of the metallized film capacitor of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are made within the scope of the present invention. It is possible to do. That is, in the above-described embodiment, at the formation position of the second margin portion 6, the upper second margin portion 6 a is formed so as to straddle the first margin portion 5 extending in the width direction of the metallized film 1. However, as shown in FIG. 3, the lower second margin portion 6b side is formed so as to straddle the first margin portion 5, and the lower second margin portion 6b in the longitudinal direction is formed between the lower second margin portions 6b. Upper second margin part 6
a may be formed. Further, as shown in FIG. 4, each of the second magic parts 6 located on the upper side and the lower side
It is also possible to form the first and second margins 5a and 6b alternately. Further, as shown in FIG. 5, the upper second margin portion 6a and the lower second margin portion 6b are provided on both sides of the first margin portion 5 as a center.
May extend in the longitudinal direction of the metallized film 1. Further, in the above-described embodiment, as shown in FIG.
Although the upper side of the lower margin portion 6b is formed on the same straight line, the positions of the lower side and the upper side of each of the margin portions 6a, 6b are not on the same straight line but may be formed apart from each other. Good. According to the metallized film capacitor of the first aspect, even if the masking oil is sufficiently supplied to the protruding portion of the printing roll for forming the second margin portion,
Due to the oil dripping or the like, it is possible to prevent the occurrence of a bridge between the ends of the oil application pattern corresponding to the second margin portion. Accordingly, it is possible to reliably secure the fuse portion between the second margin portions formed by metal deposition, and to prevent extra deposited metal from adhering to the second margin portion due to insufficient oil supply. You can also. As a result, a good fuse operation can be obtained, so that the performance of the metallized film can be stabilized and the quality can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic plan view showing a surface of a metallized film of a metallized film capacitor according to one embodiment of the present invention. FIG. 2 is a partially enlarged view of a metallized film in the embodiment. FIG. 3 is a schematic plan view showing a modified example of the metallized film in the embodiment. FIG. 4 is a schematic plan view showing a modified example of the metallized film in the embodiment. FIG. 5 is a schematic plan view showing a modified example of the metallized film in the embodiment. FIG. 6 is a schematic plan view showing a surface of a metallized film of a conventional metallized film capacitor. [Description of Signs] 1 Metallized film 2 Dielectric film 3 Electrode deposited film 4 Edge insulating band 5 First margin 6 Second margin 6a Upper second margin 6b Lower second margin 7 Fuse

Claims (1)

Claims: 1. A metallized film (1) having a dielectric film (2) and an electrode-deposited film (3) formed by metal-deposition on the dielectric film (2). Forming a first margin portion (5) extending in the width direction of the metallized film (1) so that the film (3) is divided into a plurality of electrode regions in the longitudinal direction of the metallized film (1); Metallization in which a second margin portion (6) extending discontinuously in the longitudinal direction of the metallized film (1) is formed, and the discontinuous portion of the second margin portion (6) is configured as a fuse portion (7). In the film capacitor, the second margin portions (6) adjacent to each other via the fuse portion (7) are configured not to overlap in the longitudinal direction and the width direction of the metallized film (1). Metallized fi Beam capacitor.